> If you only want the file names, this *might* work, I'm not sure ...
> find / -exec "fgrep this-is-the-string '{}' | awk -F: '{print $1}'" \;
> (DOUBLE UGGGHHH)
> --
Or maybe...
find / -exec "fgrep this-is-the-string '{}' | awk '{print FILENAME}'" \;