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windowsbulletin.com
Troubleshoot Error in Excel: File format and extension do not match - Windows Bulletin
When trying to open or edit an Excel file in MS Office, many users report the error “Excel cannot open the file because the file format or extension is invalid.” The full error message is as follows: “Excel cannot open the file `Filename.xlsx` because the file format or extension is invalid. Make sure the file ... Read more
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