Forum Discussion
Excel cannot open the file 'Vocabulaire.xlsx' because the file format or file extension is not valid
I tried many online tools I tried solutions like zipping, etc. I tried solutions like changing the extensions I tried converting to other formats I didn't try the permission solution as I'm on m...
Patrick2788 SergeiBaklan
Could you please test these solutions as well if you have access to a Windows-based device?
This file cannot be repaired in any way. Its contents have been overwritten completely by NUL bytes, so nothing whatsoever of the original contents is left.
- Then why does the file size seem normal?
Apparently because the existing contents have not been removed, but overwritten by bytes with value 0.