How to add a WMA audio streams to VirtualDubMod project?
Who can solve this problem? And HOW??? :unsure:
There are mp3, ogg, wav, srt in the list of supported formats. NoWMA.

You are right, the VirtualDubMod can not build AVI with WMA soundtrack.
Here is what you should do:

1. Start GraphEdit
2. File->Render Media File (here you should give your AVI file name)
3. Remove everything apart from AVI file reader (usually, the first cubicle with AVI file name in it and Output pin) and AVI splitter.
4. Go to Graph->Insert Filters and choose the following filters from the Directshow filters list:
- ASF ACM Handler
- AVI Mux
- File Writer (here you'll need to supply the output file name)
- Windows Media Source file (here you'll need to supply your WMA file name)
Choose each one of them and click on Insert Filters

5. Connect them by dragging the output pins to the input pins:
[AVI Input]->[AVI Splitter (input 01)]->[AVI Mux]->[File Writer]
[Windows Media Source]->[ASF ACM Handler]->[AVI Splitter (input 02)]

Click on play button and wait :)