here's my setup I've got a Turtle Beach Riviera with optical out connected to a Denon reciever I'm using WinDVD6 to play my AC3 Xvid files I've WinDVD6 set to SPDIF out, and on DVD's it's working fine I can see that my reciever is doing all the decoding only on these Divx/Xvid files they're not coming as Dolby Digital seems like the decoding is still being done in the software and I know these are correctly encoded AC3's since I've tried them on my standalone Divx player and they output in Dolby Digital the question is, what configuration changes should I make in order to allow the AC3 passthrough to my reciever yeah I tried with both 0.70b & AC3 Filter 1.01a RC5 in 0.7b I did SPDIF out to not effect, everything just came out in stereo on my reciever with 1.01a RC5 all I see is SPDIF with (disabled) next to it, so I don't even think it's supported I was able to use classic media player to output the AC3 stream but I don't think it's correctly transmitted since all I get from my receiver is static noise I'm outputing at 48KHZ in 24bit PCM I tried several other settings but all came out the same something I'm concerned aobut is that I think all these AC3 SPDIF settings are for MPEG2 videos sorry for the long post but here's all my info hopefully someone also has this issue and knows how to resolve it thanks