with ShadowWarrior Classic of course. not sure if i should ask about it here. i can't seem to get it to randomly play the ogg music files i copied from the GOG installation. the midi versions of the music that came with SWP works fine though.
http://www.proasm.com/sw/swdocs.html#Other

and does anyone have any idea how to make it work with twin dragon?

EDIT:SWP also seems to make the enemies move too fast and fire more rapidly. even on the easiest difficulty setting, i could get killed from uzi fire within SECONDS. but damn, it looks so pretty with upscaled textures!

not SWP related but... attached is a batch file of the menu "launcher" from the GOG version of Shadow Warrior Classic. use it so you can run SW with your own dosbox installation/ config, and windows GUI. hope it helps?

rename the doshellbat.jpg to *.bat, or open it up in a text editor to copy the commands. the batch file should be placed in the main game folder(e.g. C:\GOG Games\Shadow Warrior Complete\).

you might have to change the address for "C:\GOG Games\Shadow Warrior Complete\" and "GAME.DAT"(for the CD music), if you didn't install it into the default GOG folder.

There is another source port, I used a few years ago, JFSW:

www.jonof.id.au/jfsw

It worked just fine from what I remember.