Yeah, I figured that.*sigh*
My only guess on it is that it tells the game where to read the frames from next? But the 0 0 0 reminds me of X Y Z...
And the issue isn't MDLOps, but NWMax. I don't think people want to go digging into that can of worms...
I think if we take it out of the ASCII, import the mdl into GMax/3DSMax, work on it, export, and then add it back to the same positions, it should be fine. However, I have no idea...