help! decompressing old classic files

I've got some very old saved files (from 1995!) that I now need to access. They are compressed and there is no extension to indicate what programs was used to compress them. I don't have a Classic system so I can't decompress. Get info offers no additional info.

Any advice on how to
1) find out what program compressed it (the icon is a file cabinet with an arrow coming off each of the 4 corners).

2) get it decompressed


I would be very grateful for any help you can offer!!!