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Fix: Excel Cannot Open The File Because The File Format Or File Extension Is Not Valid
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Fix Excel Cannot Open the File 'file.xlsx' Because the File Format Is Not Valid
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Excel cannot open the file because the file format or extension is not valid
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Excel Cannot Open the File Because the File Format or File Extension Is Not Valid [3 Ways to Fix]
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Excel can't open file , Format/File Extension Is Not Valid/Corrupted [Solved] - YouTube
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How to Solve “the File Format Is Invalid” Issue
