Here are some problems that our users have asked and received explanations on
How do I restore a corrupted excel file?
Solved by X. E. in 11 mins
MICROSOFT EXCEL CORRUPTED ... excel cannot open the file because the extension is not valid
Solved by K. F. in 25 mins
Excel cannot open the file '~$experimental design.xlsx' 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.
Solved by E. E. in 18 mins
my file is not able to be opened, it says file may be corrupted
Solved by I. U. in 12 mins
Ive followed all instructions and cannot seem to open a corrupted file