Maximum PC

I'm trying to get the most out of my audio on my HTPC. Movies work great.. well for the most part, AAC 5.1's still use "Neo 6" on my receiver.

Anyway, I'm using HDMI through my 560ti to send a signal to my Onkyo TX-NR509. The games are showing "Neo 6" as well, it is my understanding that this is a stereo signal that is converted to virtual surround sound. I also read that all XBOX games are required to have Dolby Digital so shouldn't the PC version as well?

Examples: Alice, Dungeon Siege 3, Skyrim, Darksiders, etc..

Specs in case you need them:

Phenom II x4 920 -Scythe Shuriken 2
Gigabyte GA-MA785GM-US2H
4GB Kingston HyperX DDR2 1066
Zotac 560ti 1GB
1TB WD Black
2TB WD Green
Windows 7 64
Samsung Blu-Ray
Silverstone GD05
OCZ ModXStream 600w
Onkyo TX-NR509
Polk Audio Monitor II - CS2
Polk Audio Monitor II - Monitor 70 x 2
Polk Audio Monitor II - Monitor 30 x 2
BIC F12 - 12" Sub

More than likely, it's the Xbox 360 that has the mixing in it, not the game. If you want to use Dolby Digital, you have to license the technology from Dolby. If every game were required to have it, that's recurring costs that nobody wants.

If anything then, your sound card has to support it. Most mid-tier or above cards have Dolby support.