My QUICK research leads me to believe it is a Pinnacle codec, not a Blackmagic Design, which sort of makes sense, given the gear that was out at the time.
The days of proprietary codecs were dark ones indeed…
Try mpeg stream clip or downloading the ffmpeg codec collection.
Good luck!
Big Dog – Technical Director – Switcher
Road Dog Media – Vancouver, BC Canada
roaddogmedia@gmail.com