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1. answers.microsoft.com › en-us › msofficeExcel File Format or File Extension is Invalid - Microsoft...

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   10 cze 2021 · I can't open two of my Excel files. Message says "file format or file extension is invalid" Both are files I have been using for quite some time before this happened two days ago. I haven't changed the names. They are .xlsx files, saved on OneDrive. I tried some of the 'fixes' I found online, but none worked.

2. answers.microsoft.com › en-us › msofficeexcel file extension not valid or file is corrupt - Microsoft...

   answers.microsoft.com › en-us › msoffice

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   1 lut 2024 · Rename the file extension to match the format of the file, such as .xlsx or .xls: Right-click on the Excel file then go to properties > General tab > Rename the file extension. Repair your Excel file: Repair a corrupted workbook - Microsoft Support. Change Trust Center settings:

3. answers.microsoft.com › en-us › msofficeExcel error message - Excel cannot open the file...because the...

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   18 maj 2020 · I'm getting Excel cannot open the file...because the file format or file extension is not valid. Verify tha the file has not been corrupted and that the file extension matches the format of the file. All my spreadsheets were working fine (approximately 8 of them), and now I can't open them.

4. www.technewstoday.com › fix-excel-cannot-open-the-file-because-the-file-formatFix: Excel Cannot Open the File Because the File Format or File...

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   21 paź 2022 · How to Fix the “Excel Cannot Open the File Because the File Format or File Extension is Not Valid” Issue? Although the issue can cause quite the panic, the workarounds are actually pretty simple! The solutions include changing the file compatibility to repairing corrupt Excel files.

5. techcommunity.microsoft.com › t5 › excelExcel cannot be open the file 'filename.xlsx' because the file...

   techcommunity.microsoft.com › t5 › excel

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   4 lip 2020 · What Causes ‘Excel File Extension not Valid’ Error? The error may occur due to any of these reasons: 1) The file is not compatible with the MS Excel version. 2) The Excel file is corrupt or damaged FIX: Method 1 – Change the Default File Format to Save Excel Workbooks

6. www.thewindowsclub.com › excelExcel cannot open the file because the file format or extension...

   www.thewindowsclub.com › excel

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   19 cze 2021 · Excel cannot open the file because the file format or extension is not valid. This error message is encountered in the following scenarios: The file has become corrupt or damaged. The...

7. excelrescue.net › blog › how-to-fix-excel-cannot-open-the-file-because-the-file3 ways to fix "Excel cannot open the file 'filename.xlsx' because...

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   15 sty 2021 · There are several reasons why an Excel workbook will refuse to open and understanding the cause is the key to fixing it. Signs That Excel Won't Open. Sometimes the Excel program just doesn't react when you double-click on a file. Sometimes it opens but the page is either blank with empty cells or grey with no cells.