After taking a relatively circuitous route* to generate an m3u-format playlist of .ogg files, I copy-pasted the m3u into the Vendetta package, got in-game, and typed /playlist halo.m3u . The game immediately crashed out. A bug report has been submitted

*: This means individually running tracks through a Quicktime .ogg converter, importing into iTunes, making a playlist, and exporting with an m3u utility.

Yeah, I had issues with this on Linux as well.
I tried several different methods of accessing the files, including per file and using an m3u playlist and Vendetta crashed every time.
Of course, virtually all of my music is in Ogg Vorbis format, so I didn't have to go through what you did.
I filed several bug reports using the crash report thingie.