I have XL 2007 running on XP and when I try to open any file in XL I get this error.
Excel cannot open the file 'abcd.xlsx' because the file format or file extension is not valid. Verify the file had not been corrupted and the file extesion matches the format of the file.
Excel cannot open the file 'abcd.xlsx' because the file format or file extension is not valid. Verify the file had not been corrupted and the file extesion matches the format of the file.