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I had a similar situation a few years back. The files come back recovered but without a file extension which indicates what application is the correct one, Excel, Word, etc etc.
In my case they were all Excel files but your friends data is probably a mixture of various file types. Unless they are still in recognisable named structures, folders etc it's a long process to add extension names and test each file with an appropriate application. He could open each file with Notepad and see if the header information gives a clue as to what file type each one is.
To put it bluntly it is a slow and laborious task to sort them out. Took me a few days for sure.
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