In File Explorer, I clicked the View tab at the top and selected the option to view extensions. Then I renamed the extension to xls. Unfortunately, the document was empty at the opening – fortunately, it was a copy. Now I just need another solution. I appreciate your attempt to help! Finally, I tried to attach one of the files and got the error message: you could get an accurate solution much faster with a file. Select the corrupted file. Right-click on it and click on “Properties” > “Previous Version”. A list of previous versions is displayed. You need to select the option you are interested in and click “Recover” to perform the recovery. Earlier versions come from file history or restore points. I tried all the solutions published here and also all the solutions offered by Microsoft, but I did not have success. This is frustrating because I can see that the size of the recovered file is slightly larger than the obsolete file, which is consistent. The same problem also occurs with all recovered worksheets.

I still think this thing is related to One Drive. I want to try your solution to fix the corrupted file by changing the extension, but I can`t find where I can click to access it. How can I change it? After saving the file to the desktop, right-click, what should I do next? Have you tried changing the file extension from .xls to .xlsx? It turns out that the “File format and extension of Do Not Match” error can also occur because it is blocked at the property level. This is a typical event with files downloaded from the Internet or received via email attachments as a security option. Is there a way to configure Angular File Saver to export HTML web page to Excel file without seeing this Excel error message? (Without having to specify settings for the user`s trusted Excel location)) This can help us all if you upload an Excel file, not an image. Step 2.Open the “Previous Version” tab to list all the previously saved versions of the Excel file. jQuery UI Widgets › Forums › Grid › Get “File Format and Extension Do Not Match” when exporting the xls file Step 3. Change the file extension to another file format that SUPPORTS MS Excel and click “Save As”. Then check if Excel can open your file or not. This method only recovers files lost in an earlier version. This means that you may lose some changes you made to the document.

I am currently using Angular File Saver as follows: var blob = new Blob([document.getElementById(tableId).innerHTML], { type: “application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8” }); FileSaver.saveAs(blob, fileName + “.xls”); Do you receive an error message with the message “Excel cannot open the file .xlsx because the file format or file extension is invalid”? Provides quick and advanced solutions to help you resolve this error in Microsoft Office 2007, 2010, 2013, or 2016. Also, if you have lost Excel files, you can download EaseUS data recovery software to recover your files. You can restore the Excel file format or the file extension is invalid from previous versions. If you edit and edit the spreadsheet frequently, we recommend that you enable the AutoSave feature. Or you can manually copy and save your file to another safe place in case of an accident. The file format of an Excel spreadsheet is .xlsx or .xls. When the user opens a file, it opens with the same extension. However, some users may encounter an error when they try to open or edit an Excel file in Office 2003, 2007, 2010, 2013, 2016, 2019, and 365. The error message that appears is “Excel cannot open the file because the extension is invalid”. Repaired Records: Cell Information of /xl/worksheets/sheet1.xml part Download EaseUS MS Office Document Repair Tool and then follow the following step-by-step guides to repair corrupted Excel files in three steps: Unfortunately, I cannot reproduce your problem. In the demo below, I set the text color and background color on the first column and I don`t get any errors in Excel 2019.stackblitz.com/edit/github-a5f9we?file=src%2Fapp%2Fapp.component.ts Please let me know if you receive an error message when exporting the demo grid from the demo above. The xlsx format is now supported with the exportdata or exportview method, which generates the exported file on the client side without the need for a server.

Please watch the demo here: www.jqwidgets.com/jquery-widgets-demo/demos/jqxgrid/dataexportview.htm?light That`s it. Now, check if you can open the Excel file without any problem. If you want an illustrated guide, read this page: www.isumsoft.com/office/excel-cannot-open-the-file-because-extension-is-not-valid.html#way2 Step 1. Press the Windows + R keys, type excel.exe /safe and click “OK”. If you load Excel without templates or add-ins, you can see if the program is working as it should or if it is corrupted. If the problem is related to your computer or laptop, you should try using Restoro, which can scan repositories and replace corrupted and missing files. This works in most cases where the problem is due to system corruption. You can download Restoro by clicking the Download button below. Find corrupted files via filter, file path, search, etc.

Is the problem a bad encoding of xls file? This post above can be a solution? www.drupal.org/node/1269994 Hello Ivan Peevski, I understand. For now, could you make sure that when you open a file .xlsx exported with the cellclassname style, you don`t get an error message? However, I really can`t wait for you to implement cell styles for xlsx export as the new method is much more convenient. The following four frequently asked questions are very relevant to the error “Excel cannot open the file because the file format or file extension is invalid”. If you also have any of these problems, you can find the methods here. In most cases, the error message indicates the correct cause. If you see the “File format and extension of Do not match” error, the Excel file you are trying to open without success probably has a different extension than the one that is currently wired. However, when we try to open the file in Excel, we get this message: launch easeUS Data Recovery Wizard and then scan the corrupted or corrupted Excel files. Once I made this change (use “Attachment Contents” in the File Contents field), the Excel files I created opened correctly without errors. Is it also possible to optimize the dataexport file.php so that we can store files .xlsx instead of xls? Did I then specify a specific code for the xls files, as in the following example? After changing the header of the xsl template, I still get this error. The problem doesn`t seem to come from the metas. Maybe we should use XML export to create the xls file? The file format and ABC.xls extension do not match. The file may be corrupted or dangerous.

If you don`t trust the source, don`t open it. Do you still want to open it? “Excel cannot open the file `(file name)` .xlsx because the file format for the file extension is invalid” is a normal error that can occur when opening an Excel file. With the help of the above methods, this error can be easily fixed without data loss. At the same time, if I can recommend that you always include a file (without sensitive data) in your request, as far as possible. .