QUOTE(kwfine @ Jul 29 2007, 10:25)

I have already downloaded foo_input_matroska-0.9.2.0.dll for my foobar 0.942, still
I found that only a few types of mka files are supported.
Googling for some ideas how to extract the files froma single .mka file, and finally I was redirected to this thread.
I use fb2k 0.9.4.3 using the same version of foo_input_matroska as you, and I have no problems decoding AC3 and DTS to WAV.
So, what type of file is stored in your Matroska container, and to what type of codec are you trying to decode to?