Worst-case scenario: the UEd Goblin wipes the map and burns down your house.

UE1:Mesh (RTNP)

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RTNP Object >> Primitive >> Mesh (native-only)
Package: 
Engine
Direct subclass:
LodMesh
This class in other games:
UT, U1, UT2003, U2XMP, U2, UE2Runtime, UT2004