I have got some letters and here I will try to summarize them.
You wrote some decoder, where can I find it?
When I reverse-engineer some codec I add decoder to FFmpeg (and soon it goes to other multimedia players) and description to Multimedia Wiki
Do you know how WMV3 video is stored in files?
I just have general ideas how it is stored. See Multimedia Wiki ASF page for details
Help! I have WMV3 sample that does not play {correctly, at all}.
Please follow instructions here. That’s the easiest way to get help (and other people than me may be interested in your samples).