I have two connections:
1. the digital out
2. a MOTU 828mkII, which is much better, allowing upsampling to 96k, although with DVD's I use 48k.
They both do into digital inputs of the Meridian, which recognizes Dolby or DTS from DVD players. However, from the Mac I only get PCM.
I haven't tried Win DVD. Does it run on the Mac?