LP wrote:
But a good (though commercial) program is the XPKmaster package..
I think you mean
xadmaster. xpkmaster (de)compresses individual files in it's own format. xfdmaster decompresses individual files (including xpk packed files). xadmaster (de)compresses archives (though I've not actually used it, preferring to use the proper archiver executables)
Download here:
http://www.aminet.net/aminet.cgi?string=xadmasterChris