這是Doom9的Gordian Knot的描述：-

Gordian Knot rippack 0.35.0 pack2 - contains basic software to do SBC, DivX5 and XviD encoding as described in my guides - contains vStrip 0.8f CSS, DGIndex 1.2.1, BeSweet 1.5b30, azidts 0.1, vsfilter, Decomb 5.2.1, fluxsmooth, Convolution3D, Deen, TomsMoComp, AviSynth 2.55, VobSub 2.23, VirtualDubMod 1.5.10.1/2540, Nandub RC2 lumafix ecffix, chapterXtractor 0.962 and Robot4Rip 0.5.

Gordian Knot Codec Pack 1.9 - audio and video codecs for GKnot encoding if you don't have it already - contains DivX3.11alpha, DivX5.12 Pro trial, XviD Koepi 1.0.3, Huffyuv 0.2.2.1, AC3Filter 0.70b, mpgaudioax, Morgan Stream Switcher and ffdshow alpha 2004-10-12

而AC3Filter 0.70b就是用來播放AC3的，你可以檢查你的Program有沒有這項目。