This is AvX Phoenix Force.
Original download Mugen 1.0 only:
http://www.infinitymugenteam.com/Forum_345/index.php?topic=41524.0
Stage also available there, it works in WinMugen.
Now for Phoenix Force itself.
Patch files for WinMugen:
http://www.mediafire.com/download/r7la7dpwj2ydpk2/winmugenphoenix.zip
Enjoy~