Thanks HCS!^^ I converted the Files to Waves (with Test.exe) and tried to open it. WMP will shutting down. The VLC Media Player only play the first 2 Channels and I searched a solution to extract the other channels. I finally used Adobe Audition 2.0 to split the Tracks (Waves) and mix them into a final Song that looped twice with every Version theTrack has. When somebody want my Versions of the Songs, (Mp3 at 192 K´Bits) I can upload it.^^ But I think I done a big mistake because I switched the Audio-Channels. (L=R and R=L) But I don´t know at the Moment. ;)
For whatever it's worth, it wasn't a substantial change. Hopefully that speaks to the quality of the vgmstream design. Still not sure what the issue is with looping, though.