{"id":6143,"date":"2023-12-02T07:41:04","date_gmt":"2023-12-02T07:41:04","guid":{"rendered":"https:\/\/www.repairmsexcel.com\/blog\/?p=6143"},"modified":"2023-12-02T16:45:59","modified_gmt":"2023-12-02T16:45:59","slug":"fix-file-format-dont-match-error","status":"publish","type":"post","link":"https:\/\/www.repairmsexcel.com\/blog\/fix-file-format-dont-match-error","title":{"rendered":"Excel Unleashed: 10 Tips for \u201cThe File Format and Extension Of Don&#8217;t Match\u201d Error!"},"content":{"rendered":"<div class=\"1898181a2aebca931198b7f41678d855\" data-index=\"1\" style=\"float: none; margin:0px 0 0px 0; text-align:center;\">\n<style>\r\n.leaderboard { width: 320px; height: 100px; }\r\n@media(min-width: 500px) { .leaderboard { width: 468px; height: 60px; } }\r\n@media(min-width: 800px) { .leaderboard { width: 728px; height: 90px; } }\r\n<\/style>\r\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8329139124199643\" crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle leaderboard\"\r\n     style=\"display:inline-block\"\r\n\t data-full-width-responsive=\"true\"\r\n     data-ad-client=\"ca-pub-8329139124199643\"\r\n     data-ad-slot=\"1972481166\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p style=\"text-align: justify;\">Excel errors are an unavoidable part of working with spreadsheets, and one such warning message that often hinders users is &#8220;<strong>The file format and extension of don&#8217;t match<\/strong>.&#8221; Thus, if you are one such user who has encountered this, don\u2019t fret! In this blog, I will unravel the mystery behind this error, discover its causes, and most significantly how to fix it with the best working solutions.<\/p>\n<p style=\"text-align: justify;\"><!--more--><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7532 aligncenter\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/the-file-format-and-extension-of-dont-match.gif\" alt=\"The file format and extension of don't match\" width=\"910\" height=\"331\" \/><\/p>\n<p>So, let&#8217;s get started&#8230;<\/p>\n<div style='margin: 8px 0; clear: both;'><div style='background: #eafdeb; padding: 12px;'><p><strong style='font-size: 18px;'>To fix Excel file &amp; recover its worksheet data, we recommend this tool:<\/strong><\/p><p style='font-size: 17px;'>This software will prevent Excel workbook data such as BI data, financial reports & other analytical information from corruption and data loss. With this software you can rebuild corrupt Excel files and restore every single visual representation & dataset to its original, intact state in 3 easy steps:<\/p><div><ol style='font-size: 17px; margin-top: 4px;'><li><strong><a href='https:\/\/www.repairmsexcel.com\/blog\/free-download-now' target='_blank'>Try Excel File Repair Tool<\/a><\/strong> rated <i>Excellent<\/i> by Softpedia, Softonic & CNET.<\/li><li>Select the corrupt Excel file (XLS, XLSX) & click <b>Repair<\/b> to initiate the repair process.<\/li><li>Preview the repaired files and click <b>Save File<\/b> to save the files at desired location.<\/li><\/ol><\/div><\/div><\/div><br>\n<h2 style=\"text-align: left;\"><strong>What Does File Format Does Not Match File Extension Mean?<\/strong><\/h2>\n<p style=\"text-align: justify;\">The \u2018<strong>file format does not match file extension<\/strong>\u2019 is a clear sign that your MS Excel application identifies any issue with a specific file that you are trying to open. Most probably this message appears when trying to open a file format of an older version in a newer version. This error also triggers when the file is received from an insecure destination.<\/p>\n<h2 style=\"text-align: left;\"><strong>What Are The Causes Of Excel File Format and Extension Don&#8217;t Match Error?<\/strong><\/h2>\n<p style=\"text-align: justify;\">Knowledge about the reasons for this error<strong>\u00a0<\/strong>is important to apply the right solution. So, let&#8217;s have a look.<\/p>\n<h3 style=\"text-align: left;\"><strong>Wrong Extension or File Name:<\/strong><\/h3>\n<p style=\"text-align: justify;\">This specific error mainly occurs because of the wrong or different extension. This scenario arises either when the file is converted to some other format or due to the user\u2019s manual intervention.<\/p>\n<h3 style=\"text-align: justify;\"><strong>Excel File Is Blocked:<\/strong><\/h3>\n<p style=\"text-align: justify;\">In the Downloaded file of email attachments, chances are high that property levels are set blocked. Most of the email senders keep the properties blocked just for the sake of security purposes. This is also one of the reasons why <strong>Excel file could be corrupted or unsafe error.<\/strong><\/p>\n<h3 style=\"text-align: left;\"><strong>File\u2019s Incompatibility With Excel:<\/strong><\/h3>\n<p style=\"text-align: justify;\">Another reason can be that the file which you are trying to access is not incompatible with your Excel application.<\/p>\n<h3 style=\"text-align: left;\"><strong>Protected Views Is Enabled:<\/strong><\/h3>\n<p style=\"text-align: justify;\">The presence of a security option in your PC may be preventing the Excel application from opening certain files received through mail.<\/p>\n<h3><strong>Corrupted Excel File:<\/strong><\/h3>\n<p style=\"text-align: justify;\">If your xcl document is corrupted due to some unforeseen reasons, it can result in this error.<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><strong><span style=\"color: #ff0000;\">Also Read<\/span>: <a href=\"https:\/\/www.repairmsexcel.com\/blog\/excel-runtime-error-9-subscript-out-of-range\">Fix Runtime Error 9 Subscript Out of Range in Excel<\/a><\/strong><\/p>\n<\/blockquote>\n<h2 style=\"text-align: left;\"><strong>How to Fix &#8220;The File Format And Extension Of Don&#8217;t Match Excel&#8221; Error?<\/strong><\/h2>\n<p style=\"text-align: justify;\">\u00a0Below are some best applicable fixes to resolve it.<\/p>\n<h3 style=\"text-align: left;\"><strong>Tip 1- Changing The Extension Manually<\/strong><\/h3>\n<p style=\"text-align: justify;\">Maybe the Excel file which you are trying to open is in some different extension or unsupported format. So, to fix this you must try changing the extension of your Excel file to some other format.<\/p>\n<p style=\"text-align: justify;\">Here is a quick guide on how to apply this step:<\/p>\n<ul style=\"text-align: justify;\">\n<li>First, go to the <strong>File Explorer<\/strong> and hit the <strong>View<\/strong> tab.<\/li>\n<li>Now from the opened menu bar, go to the <strong>show\/hide group<\/strong>. Within this group there is an option <strong>File Name Extensions<\/strong>, put a checkmark across that.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6149 size-full\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/check-file-extension.jpg\" alt=\"check-file-extension\" width=\"779\" height=\"329\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/check-file-extension.jpg 779w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/check-file-extension-300x127.jpg 300w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/check-file-extension-768x324.jpg 768w\" sizes=\"auto, (max-width: 779px) 100vw, 779px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li>After enabling the file name extension, go to the location where you have saved your error showing Excel file.<\/li>\n<li>Make a right-click over that file and select the <strong>rename<\/strong> option.<\/li>\n<li>Change the extension to any of these formats:<strong> .xls or .xlsx or .xlsm<\/strong> and after every modification try to open your file.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">In this way, you will get the correct format which can easily open your Excel file without showing any error message.<\/p>\n<h3 style=\"text-align: left;\"><strong>Tip <\/strong><strong>2- Disable Add-ins<\/strong><\/h3>\n<p style=\"text-align: justify;\">1: Press <strong>CTRL<\/strong> key from your keyboard and along with that tap to the Excel application icon. Very soon a confirmation dialog box will pop up that will ask you to start your application in Safe mode.<\/p>\n<p style=\"text-align: justify;\">2: If even after starting the application in safe mode, the problem persists then close your Excel application. Now start your application normally and try disabling the add-ins one by one.<\/p>\n<p style=\"text-align: justify;\">3: Follow these paths to disable the add-ins: <strong>File<\/strong> &gt; <strong>Options tab.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3998 size-full\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2020\/10\/disable-add-in-in-excel-1.png\" alt=\"disable add in in excel 1\" width=\"800\" height=\"400\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2020\/10\/disable-add-in-in-excel-1.png 800w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2020\/10\/disable-add-in-in-excel-1-300x150.png 300w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2020\/10\/disable-add-in-in-excel-1-768x384.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\">4: In the opened window of <strong>Excel options<\/strong>, go to the left pane and hit the <strong>Add-ins<\/strong> <strong>tab.<\/strong><\/p>\n<p style=\"text-align: justify;\">5: Now hit the <strong>Go<\/strong> button present beside the <strong>Manage: Excel Add-ins<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1633 \" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2018\/04\/manage-add-ins.jpg\" alt=\"manage-add-ins\" width=\"763\" height=\"630\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2018\/04\/manage-add-ins.jpg 824w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2018\/04\/manage-add-ins-300x248.jpg 300w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2018\/04\/manage-add-ins-768x634.jpg 768w\" sizes=\"auto, (max-width: 763px) 100vw, 763px\" \/><\/p>\n<p style=\"text-align: justify;\">6: After that from the appearing list of Add-ins, uncheck each of the add-ins one by one to disable it.<\/p>\n<p style=\"text-align: justify;\">It\u2019s time to check whether the problem has been resolved or not.<\/p>\n<h3 style=\"text-align: left;\"><strong>Tip <\/strong><strong>3- Unblocking The File<\/strong><\/h3>\n<p style=\"text-align: justify;\">The <strong>file format and extension of don&#8217;t match Excel. The file could be corrupted or unsafe<\/strong> error also originates because it is blocked at the properties level. Usually, this problem is associated with receiving through email attachments or downloaded files on the internet.<\/p>\n<p style=\"text-align: justify;\">This problem can be easily fixed by optimizing the file\u2019s properties to unblock it.<\/p>\n<p style=\"text-align: justify;\">Follow the below given steps to unblock Excel file:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Make a right-click over the error showing the Excel file and choose the <strong>properties option<\/strong>.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6152 size-full\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/Unblocking-excel-file-1.jpg\" alt=\"the file format and extension of don't match Excel\" width=\"486\" height=\"480\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/Unblocking-excel-file-1.jpg 486w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/Unblocking-excel-file-1-300x296.jpg 300w\" sizes=\"auto, (max-width: 486px) 100vw, 486px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li>Now in the opened properties window move your cursor down here you will get the <strong>security <\/strong>section and then hit the \u201c<strong>unblock\u201d <\/strong>button.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7536 aligncenter\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/unlock-option.png\" alt=\"the file format and extension of don't match Excel\" width=\"434\" height=\"504\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li>After this step, your Excel is now unblocked. So try re-opening your Excel file and check whether this time the problem is resolved or not.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">If still you are getting the same error, then move on to the next solution.<\/p>\n<h3 style=\"text-align: left;\"><strong>Tip <\/strong><strong>4- Open And Repair Inbuilt Tool<\/strong><\/h3>\n<p style=\"text-align: justify;\"><strong>Open and repair an inbuilt tool <\/strong>is the best option to resolve minor corruption or issues occurring in Excel files.<\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"text-align: left;\">Hit the <strong>file<\/strong> tab and choose the <strong>open <\/strong>option.<\/li>\n<li style=\"text-align: left;\">Make a selection of the Excel file in which you are frequently getting this error.<\/li>\n<li style=\"text-align: left;\">Now hit the arrow sign present next to the <strong>open <\/strong> Now from the drop-down menu choose the <strong>open and repair<\/strong> option.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7228 aligncenter\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2023\/09\/excel-open-and-repair-1.png\" alt=\"unable to save Excel workbook\" width=\"769\" height=\"526\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2023\/09\/excel-open-and-repair-1.png 972w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2023\/09\/excel-open-and-repair-1-768x525.png 768w\" sizes=\"auto, (max-width: 769px) 100vw, 769px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li>After that hit the <strong>repair<\/strong> button.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3673 aligncenter\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2017\/04\/excel-open-and-repair.jpg\" alt=\"excel open and repair\" width=\"847\" height=\"174\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2017\/04\/excel-open-and-repair.jpg 847w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2017\/04\/excel-open-and-repair-300x62.jpg 300w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2017\/04\/excel-open-and-repair-768x158.jpg 768w\" sizes=\"auto, (max-width: 847px) 100vw, 847px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"text-align: left;\">If in case, this repair solution won\u2019t fix the issue then repeat the above steps and hit the \u201c<strong>Extract Data\u201d <\/strong>option.<\/li>\n<li style=\"text-align: left;\">In this way, you can very easily extract data from your Excel file.<\/li>\n<\/ul>\n<blockquote>\n<p style=\"text-align: center;\"><strong><span style=\"color: #ff0000;\">Also Read<\/span>: <a href=\"https:\/\/www.repairmsexcel.com\/blog\/fix-excel-reference-isnt-valid\">Fix \u201cMicrosoft Excel Reference Isn\u2019t Valid\u201d Error<\/a><\/strong><\/p>\n<\/blockquote>\n<h3 style=\"text-align: left;\"><strong>Tip 5- Check &amp; Grant Excel File Permissions<\/strong><\/h3>\n<p style=\"text-align: justify;\">Many users have reported that they received the \u2018Excel the file format and extension don&#8217;t match\u2019 error due to insufficient file permissions to access the XLS file. It might be possible that due to this reason, you\u2019re also facing this error. You can verify &amp; provide the required permissions to the file to fix it.<\/p>\n<h3 style=\"text-align: left;\"><strong>Tip 6- Disable The Protected View<\/strong><\/h3>\n<p style=\"text-align: justify;\">File extensions don\u2019t match error also occurs when some new security option like protected view prevents the opening of certain Excel files. Mainly such type of issue arises with the Excel files which were received through the email attachments.<\/p>\n<p style=\"text-align: justify;\">Well, this security setting can be easily cracked by disabling the protected view feature. So, here are the steps that you should follow to disable the Protected View setting.<\/p>\n<ul style=\"text-align: justify;\">\n<li>Open your <strong>Excel<\/strong> application.<\/li>\n<li>Hit the <strong>File&gt; options<b>\u00a0<\/b><span style=\"font-weight: 400;\">tab.<\/span><\/strong><\/li>\n<li>This will open the <strong>Excel options <\/strong>settings window.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3754 size-full\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2020\/08\/file-options-menu.png\" alt=\"Excel options\" width=\"749\" height=\"683\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2020\/08\/file-options-menu.png 749w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2020\/08\/file-options-menu-300x274.png 300w\" sizes=\"auto, (max-width: 749px) 100vw, 749px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li>From the left side navigation pane, choose the <strong>Trust-center\u00a0<span style=\"font-weight: 400;\">tab.<\/span><\/strong><\/li>\n<li>Now from the opened window hit the <strong>Trust Center Settings.<\/strong><\/li>\n<li>On the left side of the <strong>Trust Center<\/strong> window, you have chosen the <strong>Protected View<\/strong>.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6054 aligncenter\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2021\/12\/15.png\" alt=\"Turn OFF The Protected View Option\" width=\"673\" height=\"430\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2021\/12\/15.png 673w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2021\/12\/15-300x192.png 300w\" sizes=\"auto, (max-width: 673px) 100vw, 673px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li>After that unselect all the previously selected options present <strong>within the protected view.<\/strong><\/li>\n<li>Hit the <strong>Ok<\/strong> button to close the window.<\/li>\n<\/ul>\n<h3 style=\"text-align: left;\"><strong>Tip 7-<\/strong><strong>\u00a0Suppress The Error Warning Message<\/strong><\/h3>\n<p style=\"text-align: justify;\">Another alternative option that you can try to troubleshoot is by creating the registry key to suppress this warning error message.<\/p>\n<div class=\"su-note\"  style=\"border-color:#dad9d9;border-radius:2px;-moz-border-radius:2px;-webkit-border-radius:2px;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#f4f3f3;border-color:#ffffff;color:#333333;border-radius:2px;-moz-border-radius:2px;-webkit-border-radius:2px;\">\n<p style=\"text-align: justify;\"><strong><span style=\"color: #ff0000;\">Note<\/span><\/strong>: making changes in the system registry setting is a bit risky and it can put your PC in a cumbersome situation.<\/p>\n<\/div><\/div>\n<p style=\"text-align: justify;\">Here is a quick guide on how you can suppress this <strong>Excel file format and extension don&#8217;t match error <\/strong>through the usage of the <strong>registry editor<\/strong>:<\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"text-align: left;\">\u00a0 Hit <strong>Windows + R<\/strong> key together this will open the dialog box of <strong>Run<\/strong>.<\/li>\n<li style=\"text-align: left;\">\u00a0In this Run box, enter the text <strong>\u2018regedit\u2019<\/strong> and hit the <strong>Enter<\/strong> button. This will open the <strong>Registry Editor<\/strong>.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6154 aligncenter\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/regedit.png\" alt=\"regedit\" width=\"399\" height=\"206\" srcset=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/regedit.png 399w, https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/regedit-300x155.png 300w\" sizes=\"auto, (max-width: 399px) 100vw, 399px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li>Now in the prompt box opened through <strong>UAC (User Account Control)<\/strong>, you need to hit the <strong>yes<\/strong> button.<\/li>\n<li>After getting into the <strong>Registry Editor utility<\/strong>, go to the right-side pane and search for the following path.<\/li>\n<\/ul>\n<div class=\"su-note\"  style=\"border-color:#dad9d9;border-radius:2px;-moz-border-radius:2px;-webkit-border-radius:2px;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#f4f3f3;border-color:#ffffff;color:#333333;border-radius:2px;-moz-border-radius:2px;-webkit-border-radius:2px;\">\n<p style=\"text-align: justify;\"><strong>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\*X*\\Excel\\Security<\/strong><\/p>\n<\/div><\/div>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #ff0000;\">Note<\/span>:<\/strong> as an alternative option you can also copy and paste this location on the navigation bar and hit the <strong>enter<\/strong> button.<\/p>\n<p style=\"text-align: justify;\">In the above-given path\u201d x\u201d is to be replaced with your currently installed MS Office version.<\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"text-align: left;\">After getting into the correct location, shift to the right-side pane, and make a right-click over the empty space. Choose \u201c<strong>NEW\u201d <\/strong>and then<strong> \u201cDword (32-bit) value\u201d<\/strong>.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7451 aligncenter\" src=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2018\/01\/DWORD32bit.webp\" alt=\"DWORD (32-bit) Value\" width=\"594\" height=\"431\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"text-align: left;\">Name this <strong>DWORD<\/strong> value as <strong>Extension Hardening.<\/strong> After that, double-tap over it.<\/li>\n<li style=\"text-align: left;\">Now set the <strong>Base<\/strong> as <strong>Hexadecimal<\/strong> and the value as 0.<\/li>\n<li style=\"text-align: left;\">Once you complete all these changes, shut down the <strong>Registry Editor<\/strong> and give a restart to your PC.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">After the fresh start of the system, you won\u2019t get this annoying Excel error message.<\/p>\n<h3 style=\"text-align: left;\"><strong>Tip 8-<\/strong><strong> Fix Excel File Corruption Using Excel Repair Tool<\/strong><\/h3>\n<p style=\"text-align: justify;\">Even after trying the above solutions, if the error persists, then it\u2019s recommended to use the\u00a0<a href=\"https:\/\/www.repairmsexcel.com\/download-excel-repair.php\" target=\"_blank\" rel=\"noopener\"><strong>MS Excel Repair Tool<\/strong><\/a>. This is the best program to fix any sort of issues, corruption, or errors in Excel workbooks.<\/p>\n<p style=\"text-align: justify;\">So if you are getting this error because of Excel file damage or corruption issues then this tool will surely resolve it.<\/p>\n<p style=\"text-align: justify;\">With the help of this tool, you can easily restore all corrupt Excel files including the <strong>charts, worksheet properties, cell comments<\/strong>, and other important data. This is a unique tool to repair multiple Excel files in one repair cycle and recover the entire data in a preferred location.<\/p>\n<h4 style=\"text-align: left;\"><strong>Steps To Repair Corrupt Excel File:<\/strong><\/h4>\n<p style=\"text-align: left;\">\n<blockquote>\n<p style=\"text-align: center;\"><strong><span style=\"color: #ff0000;\">Also Read<\/span>: <a href=\"https:\/\/www.repairmsexcel.com\/blog\/resolve-excel-sharing-violation-error\">Fix Excel Sharing Violation Error<\/a><\/strong><\/p>\n<\/blockquote>\n<h3 style=\"text-align: left;\"><strong>Tip 9-<\/strong><strong>\u00a0Open Excel File Without Excel<\/strong><\/h3>\n<p style=\"text-align: justify;\">If your Excel file is refusing to open because of the file format or extension issue then you can try to open it using 3<sup>rd<\/sup> party apps. Yes, there are so many alternative options available to <strong><a href=\"https:\/\/www.repairmsexcel.com\/blog\/open-excel-files-without-excel\" target=\"_blank\" rel=\"noopener\">open Excel files without Excel<\/a>.<\/strong><\/p>\n<p style=\"text-align: justify;\">Here are the following options using which you can easily perform this task: <strong>Chrome Browser\u2019s Free Extension; Excel Viewer, Apache Open Office and many more.<\/strong><\/p>\n<h3 style=\"text-align: left;\"><strong>Tip 10- Seek Expert Help to Solve the File Format and Extension Of Don&#8217;t Match Excel Error<\/strong><\/h3>\n<p style=\"text-align: justify;\">Last but not least, if all the DIY fixes fail to fix this error message, it is suggested to seek professional assistance. They will surely assist you to the outcome of the situation.<\/p>\n<h2 style=\"text-align: left;\"><strong>Frequently Asked Questions:<\/strong><\/h2>\n        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>Can I Lose My Data If I Encounter This Error?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tYes, you can lose your crucial Excel worksheet data when you encounter this error.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>Is Renaming The File The Only Manual Solution?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tApart from renaming the Excel file, there are some other manual solutions as well that I have explored in this guide                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>How Do I Fix An XLSX File That Is Showing This Error?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tBy implementing the solutions mentioned above in this blog, you can fix XLSX file that is showing this error                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>How to Avoid This Error?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tRegular backing up your Excel file data, updating your Excel application, and checking for wrong file extension can help you to avoid this error.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t\n<script type=\"application\/ld+json\">\n    {\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Can I Lose My Data If I Encounter This Error?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Yes, you can lose your crucial Excel worksheet data when you encounter this error.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Is Renaming The File The Only Manual Solution?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Apart from renaming the Excel file, there are some other manual solutions as well that I have explored in this guide\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"How Do I Fix An XLSX File That Is Showing This Error?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"By implementing the solutions mentioned above in this blog, you can fix XLSX file that is showing this error\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"How to Avoid This Error?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Regular backing up your Excel file data, updating your Excel application, and checking for wrong file extension can help you to avoid this error.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t    ]\n}\n<\/script>\n\n<h2 style=\"text-align: left;\"><strong>Final Verdict<\/strong><\/h2>\n<p style=\"text-align: justify;\">Now you can<strong> fix Excel file format extension doesn\u2019t match the error <\/strong>on your own. But make sure to follow the given fixes very carefully. Moreover, feel free to run the Excel repair tool, to fix any type of internal issues and errors that might be causing the error in your Excel file.<\/p>\n<p style=\"text-align: justify;\">If I missed out on any solution or if you have any other trick to fix this error, then do share it with us on our <a href=\"https:\/\/www.facebook.com\/MS-Excel-Repair-Tool-1569953153234271\" target=\"_blank\" rel=\"noopener\"><strong>Facebook<\/strong><\/a> page.<\/p>\n<div class=\"su-note\"  style=\"border-color:#dad9d9;border-radius:2px;-moz-border-radius:2px;-webkit-border-radius:2px;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#f4f3f3;border-color:#ffffff;color:#333333;border-radius:2px;-moz-border-radius:2px;-webkit-border-radius:2px;\">\n<p><strong>References:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/support.microsoft.com\/en-us\/office\/repair-a-corrupted-workbook-153a45f4-6cab-44b1-93ca-801ddcd4ea53\" target=\"_blank\" rel=\"noopener\">https:\/\/support.microsoft.com\/en-us\/office\/repair-a-corrupted-workbook-153a45f4-6cab-44b1-93ca-801ddcd4ea53<\/a><\/li>\n<li><a href=\"https:\/\/techcommunity.microsoft.com\/t5\/excel\/in-excel-quot-the-file-format-and-extension-don-t-match\/m-p\/3249901\">https:\/\/techcommunity.microsoft.com\/t5\/excel\/in-excel-quot-the-file-format-and-extension-don-t-match\/m-p\/3249901<\/a><\/li>\n<\/ul>\n<\/div><\/div>\n<p style=\"text-align: justify;\"><br><center><a href='https:\/\/www.repairmsexcel.com\/blog\/free-download-now' title='Try Excel Repair Now'><img src='https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2017\/08\/729x120-en.png' \/><\/a><\/center><br>\n\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Excel errors are an unavoidable part of working with spreadsheets, and one such warning message that often hinders users is &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Excel Unleashed: 10 Tips for \u201cThe File Format and Extension Of Don&#8217;t Match\u201d Error!\" class=\"read-more button\" href=\"https:\/\/www.repairmsexcel.com\/blog\/fix-file-format-dont-match-error#more-6143\" aria-label=\"Read more about Excel Unleashed: 10 Tips for \u201cThe File Format and Extension Of Don&#8217;t Match\u201d Error!\">Read more<\/a><\/p>\n","protected":false},"author":5,"featured_media":6476,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42],"tags":[1566,1564,1565],"class_list":["post-6143","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-excel-errors","tag-excel-file-format-and-extension-dont-match","tag-the-file-format-and-extension-of-dont-match-excel","tag-the-file-format-and-extension-of-dont-match-excel-the-file-could-be-corrupted-or-unsafe","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Excel Unleashed: 10 Tips for \u201cThe File Format and Extension Of Don&#039;t Match\u201d Error!<\/title>\n<meta name=\"description\" content=\"Whether you&#039;re a beginner or a pro user, this blog is your go-to resource for fixing the file format and extension of don&#039;t match Excel error!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.repairmsexcel.com\/blog\/fix-file-format-dont-match-error\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Excel Unleashed: 10 Tips for \u201cThe File Format and Extension Of Don&#039;t Match\u201d Error!\" \/>\n<meta property=\"og:description\" content=\"Whether you&#039;re a beginner or a pro user, this blog is your go-to resource for fixing the file format and extension of don&#039;t match Excel error!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.repairmsexcel.com\/blog\/fix-file-format-dont-match-error\" \/>\n<meta property=\"og:site_name\" content=\"Excel File Repair Blog\" \/>\n<meta property=\"article:published_time\" content=\"2023-12-02T07:41:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-12-02T16:45:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.repairmsexcel.com\/blog\/wp-content\/uploads\/2022\/02\/Untitled-1-copy.png\" \/>\n\t<meta property=\"og:image:width\" content=\"550\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Priyanka Sahu\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Priyanka Sahu\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.repairmsexcel.com\\\/blog\\\/fix-file-format-dont-match-error#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.repairmsexcel.com\\\/blog\\\/fix-file-format-dont-match-error\"},\"author\":{\"name\":\"Priyanka Sahu\",\"@id\":\"https:\\\/\\\/www.repairmsexcel.com\\\/blog\\\/#\\\/schema\\\/person\\\/ab2250dcc6b25c12e617748b1fc166e3\"},\"headline\":\"Excel Unleashed: 10 Tips for \u201cThe File Format and Extension Of Don&#8217;t Match\u201d Error!\",\"datePublished\":\"2023-12-02T07:41:04+00:00\",\"dateModified\":\"2023-12-02T16:45:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.repairmsexcel.com\\\/blog\\\/fix-file-format-dont-match-error\"},\"wordCount\":2000,\"publisher\":{\"@id\":\"https:\\\/\\\/www.repairmsexcel.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.repairmsexcel.com\\\/blog\\\/fix-file-format-dont-match-error#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.repairmsexcel.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/02\\\/Untitled-1-copy.png\",\"keywords\":[\"Excel file format and extension don't match\",\"the file format and extension of don't match Excel\",\"the file format and extension of don't match Excel. 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