First of all, dolby is not a middleware
Secondly I find really difficult that a computer game could had embedded dolby digital... I mean.. I'm so suspicious that even if dolby logo was shown on startup and in credits I would think it's just a console remnant (and indeed this is the case in BFBC2)
It's not even like I didn't find anything for SC:CT (see this and this) but... please do some tests