Worst-case scenario: the UEd Goblin wipes the map and burns down your house.
SuperApe: Looking for confirmation about the implementation of this file format. There's a need for UT people to help with this info.
Xian: I don't remember any documentation on this for UT99. At most there's a higher chance of finding it for U1, although I doubt it. I'd stick with U2 and remove the "Pawn (UT)" reference (of course I could be wrong).