Bridge doesn't license all of the codecs that the video and audio applications do, so not all file types supported by Premiere Pro are supported by Bridge.
thanks for the follow-up... what i find odd is that the same files preview fine on my old setup running CS4. could Adobe have dropped AC-3 licensing from Bridge CS5 ?
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Previous versions of After Effects and Premiere Pro installed both DLLs and ActiveX controls for codecs licensed from third parties. After Effects CS5 (and later) and Premiere Pro CS5 (and later) only install the DLLs, because we don't need the ActiveX controls, and they were just causing problems. Unknown to us, Bridge CS4 was relying on those ActiveX controls being installed. So, Bridge CS5 and later---not having these codecs---can't play some kinds of files.
In a manner of speaking, Bridge CS4 being able to play these files was an accident.
If you want to have AC-3 preview in Bridge, you should make a feature request.
thanks for the answer.. not the one i was hoping for ...[a patch is available or modify this setting] but at least a very authoritive one. i will add my voice to the wishlist for AC-3 and fill the form on the link you provided
Absolutely do file a Feature Request, per Todd's link. Often, things will be done for some programs, and there can be "trickle down effects" for others, like Bridge. Adobe tries to cover every base, but that becomes very difficult. What works in PrPro, AE or others, might "break" something in a program, like Bridge. Please let Adobe know.