What extensions did the files originally have?
In the meantime, here's a couple more ideas in adddition to the info already posted (a search for "limewire document" will give more.
Here's one link for starts).
if the file had an "exe" extension--forget it--those are mostly Windows programs
-if you know the extension these files should have, as shown in the search results, just add it yourself after the file completes, since OS9 will truncate long file names.
-if you know what the file type/creator codes are supposed to be, you can use something like
File Type to set the icon properly. btw--Filetype also runs on MacOS 8.6
--if nothing else works, try using a program that can look at the first bit of a file as text. I recall very limited success using Norton or BBEdit to to see what program created the file back in the day.
Cheers