ThomasBens 0 Newbie Poster

What tools have people had the most success with for repairing corrupt Excel files?

I have had 2 people come to me recently with corrupt Excel files (oolone was XLS and the other XLSX). I tried opening the files with versions of Excel and repair but nothing. I then tried using LibreOffice to open the file, but nothing.

Pay tools?

Any good free tools?