Cannot select iTunes Audio Track 2 / Dolby Digital

Hello,
I have a sound card (from Maplin, CMI-8738) with digital optical output configured to use SPDIF output and connected to a Denon Surround Receiver. The sound card is outputting dolby digital fine, when I play a test Dolby Digital encoded file on VLC media player (although this doesn't play on iTunes, it proves that my system can play dolby digital).
However, when I downloaded the movie trailer "Scrat's Continental Crack Up, Pt. 2" from iTunes, there were 2 audio tracks displayed from the "Get Info" right-click menu (stereo + Dolby Digital 5.1) but only one is selectable whilst the movie is playing - English (Audio Track 1). English (Audio Track 2), which is the 5.1 track is grey and cannot be selected.
I'm pretty sure the second track is the 5.1 track, as I've also downloaded rental movies which have a "surround audio" track which is also not selectable.
iTunes must have a reason to not allow access to the second audio tracks. I've also tried in Quicktime and it does exactly the same.
I have the latest iTunes 10.6.1.7 / Windows XP.
Any ideas?
Martin Dye.

See if this can help you (last part where I mention about the settings for allowing exclusive use for applications.
https://discussions.apple.com/thread/3803912?start=0&tstart=0

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