kmodplayer can deal with all commond compression schemes. However you must have the required decompress program for each of the following types: zip, lzh/lhz, zoo, gzip and arj. Most of those are probably already on your machine, you can find lha which is still very common for mod files here: ftp://sunsite.unc.edu/pub/Linux/distributions/slackware/source/a/bin/lha-1.00.tar.gz