Problem opening recoved files

I successfully found a number of files that I had thought I had totally lost, and restored some that were an "excellent" state. I saved them to a different drive, as recommended, however when I open them I get error messages. For instance, for most of the MS Word docs, I keep getting errors that they can't be decoded, etc. For a MS Powerpoint file, it just said that it couldn't be opened. I tried again using a deep scan, but had the same problem. Am I doing something wrong? Thanks for any help you can provide.