Answer by Crazy Brit for Excel 2010 File Format/Extension Not Valid. Unable...
I've had success sometimes with this by going into the DOS command prompt and renaming the file there. Works if it is truly an Excel 2010 file.
View ArticleAnswer by mander for Excel 2010 File Format/Extension Not Valid. Unable to...
I would like to share my experience. Every time I update my Microsoft Office 2010 version my Excel file fails to open. I would get the same pop up as pictured above by Siva Charan: Excel cannot...
View ArticleAnswer by Bill T for Excel 2010 File Format/Extension Not Valid. Unable to...
See if you have the Compatibility Pack for the 2007 Office System installed on the troubled machines. If you are running Office 2010, you no longer need this and I believe it causes this problem in...
View ArticleAnswer by mjrider for Excel 2010 File Format/Extension Not Valid. Unable to...
have you tried opening this file on a different machine / os? currently cant tell if it is your machine or a issue with the file itself. first step would be to figure out if your FILE is valid. I dont...
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Answer by Siva Charan for Excel 2010 File Format/Extension Not Valid. Unable...
I suspect, the file is not an excel file. This can be some other extension file, which has been changed to .xlsx format.EDIT:This is bit difficult to say, what is the actual file format?But below is...
View ArticleExcel 2010 File Format/Extension Not Valid. Unable to Manually Change File...
I am at work and having problems opening an excel file. I continue to get the error:Excel cannot open the file XXX.xlsx" because the file format or file extension is not valid. Verify that the file has...
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