.MSW files are indeed Music, Stereo, and Words. But, IIRC, the rights to the self-dissolving ARC compression format is now a privately owned copyright by some PC manufacturer and are therefore no longer freely distributable.
I doubt Delitracker would touch these files since they are not Amiga file formats.
You might look into a C64 Emulator such as VICE to play these on the Amiga.
