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8 ways to fix Excel Cannot Open Because The File Format Is Not Valid error

Solution 7: Open MS Excel in Safe Mode Solving the “ Excel cannot open because the file format is not valid ” problem can sometimes be as simple as booting your computer into Safe Mode . This is ...
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Excel cannot open file because file format or extension is not valid

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.