Download Xls file format is not valid fix

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Cannot open.xlsx file because format / extension is not valid XL2007 This is a discussion on Cannot open.xlsx file because format / extension is not valid XL2007. Sep 18, 2011When you try to open a text or comma separated variable CSV file, you receive the following error message:. Excel cannot open the file Report.xlsx because the file format or extension is not valid. Verify that the file has not been corrupted and that the file extension. I would like to share my experience. Every time I update my Microsoft Office 2010 version my Excel file fails to open. I Xls file format is not valid fix get the same pop up as pictured above. . Every now and then, when I try opening an Excel file, I get a message saying that Excel cannot open the file 'file. 30 replies Microsoft Office. By some chance was the file opened with a different application maybe Word and saved as a Word doc with an xls extension. Re: Excel cannot open the file filename.xlsm because the fie format or file extension is not valid.but only on some Xls file format is not valid fix. First try to rename file. Go to tools, folder options, file types and check have you.xlsx extension. If not then rename the file.xlsx to.xls. Updated 9/11 - Excel cannot open the file filename because the file format or file extension is not valid. opening Office files.