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Excell file will not open

%3CLINGO-SUB%20id%3D%22lingo-sub-648373%22%20slang%3D%22en-US%22%3EExcell%20file%20will%20not%20open%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-648373%22%20slang%3D%22en-US%22%3E%3CP%3EExcel%20Office%20365%20(older%20files)%20will%20no%26nbsp%3B%20longer%20open%3C%2FP%3E%3CP%3EAll%20have%20the%20.xlsx%20extension%3C%2FP%3E%3CP%3EI%20get%20error%20message%22%20that%20the%20file%20format%20or%20extension%20is%20not%20valid%20or%20file%20is%20corrupt%22%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EWhat%20can%20I%20do%20to%20resolve%20this%3F%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-648373%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3ENeed%20Help%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-648668%22%20slang%3D%22en-US%22%3ERe%3A%20Excell%20file%20will%20not%20open%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-648668%22%20slang%3D%22en-US%22%3E%3CP%3E%3CA%20href%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fuser%2Fviewprofilepage%2Fuser-id%2F349047%22%20target%3D%22_blank%22%3E%40walkerstoo%3C%2FA%3E%26nbsp%3B%3C%2FP%3E%3CP%3EIt%20usually%20works%20if%20you%20close%20Excel%20and%20start%20again.%3C%2FP%3E%3CP%3ENote%3A%20Check%20the%20task%20manager%20(process%20tab)%20to%20verify%20that%20Excel%20(and%20Microsoft.Mashup%20processes)%20are%20really%20closed.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E
walkerstoo
Occasional Visitor

Excel Office 365 (older files) will no  longer open

All have the .xlsx extension

I get error message" that the file format or extension is not valid or file is corrupt"

 

What can I do to resolve this?

 

1 Reply

@walkerstoo 

It usually works if you close Excel and start again.

Note: Check the task manager (process tab) to verify that Excel (and Microsoft.Mashup processes) are really closed.

 

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