VirtualDubMod Does not recognize wave

[Tinkerbell]

I was trying to make a vcd with the new type of format "mkv". Some of the mkv files were able to be taken apart and put back together. When I try to do a another series, I could not save the audio 1(as seen on the picture) because the wave is unsopported. Anyone know a way I could save audio 1 in a wave/pcm format. Is there a codec I could download to fix the problem. Any help will do. Thanks in advanced.

[Baldrick]

demux the audio and convert the aac audio with another aac to wav converter(gooogle).

[Tinkerbell]

Thanks for the info. I try to convert aac file with three converters, but not one of them convert the file correctly. Do you know of any good aac to wav convert? Here the converters I used dbpoweramp, Xilisoft MP3 WAV Converter, and Easy CD Ripper. I'm so close to giving up , and I really don't want too.