I had the same problem, but I'll try to describe the problem better..
Config: W7 64-bit, honest licencse, DirectX 11, WMP 12.0, VLC 2.0.3
Codec: A52 Audio (aka AC3)(a52)
There are sound when i play the file in mediaplayer and vlc-player.
Other files that have Codec MPEG Audio layer 1/2/3 (mpga) works fine.
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All files works fine on my old comuter with the following config:
XP Home Ed SP2, honest licence, DirectX 9.0c, WMP 9.0, VLC 1.0.5
The only difference was that i had the ac3-codec installed on the xp-computer, so i installed the ac3-filter on my w7-computer and hureka there was sound!
Here is the link to the ac3-filter:
http://www.softpedia.com/get/Multimedia/Audio/Audio-CD-Rippers-Encoders/AC3-Filter-a-RC.shtmlAnd many thanks IREK for your excellent software !
