And if you're not using OS3.9 (you did say it was an A2K)...
Grab a copy of various archivers from Aminet. I suggest:
LHArc
LHA
LZH or LZ
UnArc and Arc
Zoo
Booz
PKAZip
UnZip
I don't think RAR was ever ported to Amiga, so don't worry about it. While you're in there, you may want to pick up full-disk archivers, like BlitzADF and DMS. Couldn't hurt.
Now, all those should be either self-extracting or uncompressed for convenience. Once you have those, just copy/move the whole lot into your C directory. Once in there, they can be used anytime.
Why so many? Well, if you D/L a program that someone has used LHArc to encode, and provided an icon whose tooltype wants "C:LHArc" to uncompress, and all you have is LHA (which will still work), then you're going nowhere. This method provides for most archive contingencies.
A neat side-effect of all this is that DM2 should now see LHArc in your C directory, and add it to one of the drop-down menus. Or it should just auto-extract when double-clicked (I forget which - I edited my DM2 config to add a button).
The command, by the way, is: "lharc -x filename" to extract, and "lharc -a mainfile file1 file2 file3 {etc}" to add (create) an archive. Typing "lharc ?" will get you the help file.
banzai
