Cannot open - file format or file extension is not valid. Verify file not corrupted and that ext mat

%3CLINGO-SUB%20id%3D%22lingo-sub-2033037%22%20slang%3D%22en-US%22%3ECannot%20open%20-%20file%20format%20or%20file%20extension%20is%20not%20valid.%20Verify%20file%20not%20corrupted%20and%20that%20ext%20mat%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2033037%22%20slang%3D%22en-US%22%3E%3CP%3EHad%20an%20excel%20file%20opened.%20Rebooted%20machine.%20Now%20excel%20file%20will%20not%20open.%20It%20says%20%22Excel%20cannot%20open%20the%20file%20XXXXX%20because%20the%20file%20format%20or%20file%20extension%20is%20not%20valid.%20Verify%20that%20the%20file%20has%20not%20been%20corrupted%20and%20that%20the%20file%20extension%20matches%20the%20format%20of%20the%20file.%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAny%20suggestions%3F%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EJody%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2033037%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExcel%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
Occasional Visitor

Had an excel file opened. Rebooted machine. Now excel file will not open. It says "Excel cannot open the file XXXXX 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. 

 

Any suggestions?

 

Jody

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