Convert a non-supported/obscure codec to a supported codec
I found a reference to this codec perhaps being used by the SIMI motion capture software; chances are it's uncompressed (if a high bit rate?) or lightly compressed AVI with additional data streams. Perhaps some stupid bitstream obfuscation... Less likely, but perhaps just a commodity codec like ASF/WMV in an AVI container?

Discussion of SIMI software found on http://birdz.sk/forum/avi-nevie-pehrat-ziaden-prehravac/138108-tema.html/ . Perhaps contacting the software developer is worth a shot.

If not, I'd try experimenting with the FOURCC changer (https://www.fourcc.org/changer/) and see if you can get WMP, VLC or mplayer to accept this file without baulking at any ancillary data.

Maybe ffmpeg could be forced to demux just the video assuming a format, allowing you to reencode? Have you got a clip available to post for analysis?