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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...
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.