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How to Fix excel cannot open the file …. because the file format or file extension is not valid.
How to Fix error Excel Cannot Open the file ‘New Microsoft Office Excel Worksheet.xlsx’ because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file. It is very common problem in MS Excel worksheet and you can solve this error by following some steps.
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How to fix excel cannot open the file because the extension is not valid windows 7
How to fix excel cannot open the file because…