Excel file extinction is not valid on Windows File Server 2008

Occasional Visitor



We have Windows File Server 2008 R2 and shared to the end users, It has many files (Excel, Words and PDF's),


Server hanged and all users got this error (Excel cannot open the file because the file format or file extinction is not valid) only for the files were open, And all old files are fine,


We tried to repair online tools, Excel recovery/fix tools /application, And with the excel repair option, Checked the unsaved files with no luck,


Anyone can help us on this please.


Thank You

1 Reply

RDS users? May need to repair or reinstall office.


Desktop users? Try copying the files local and if problems persist I'd suggest reaching out to subject matter experts in dedicated forums here.