For every level defined there is offset file (Theater.On) and a blockpost file (Theater.Ln)
 
 

Organisation for  Level of Detail The O Files These files define the offsets to the Blocks. They are loaded very early on in the program, which makes the implementation of the visible theater selector in the UI nearly impossible. The F4terrain group has developed scripts and tools that install the additional theater and tweaks the registry entries of the game to the new theater directories. During WinMainHandle TheMap is setup which will build the Level Classes By reading the Theater.Map Theater.Mea and all Theater.On Files. The numbers here are those used by the standard Korea Theater. The TLevel  FILE loaading:tBlkAddress Filename Filesize Nr-Pointers Organisation Theater.o0 262144 65536 256x256 Theater.o1 65536 16384 128x128 Theater.02 16384 4096 64x64 Theater.o3 4096 1024 32x32 Theater.o4 1024 256 16x16 Theater.o5 256 64 8x8 All files are in fact arrays of pointers into the POSTFILE

THE POSTFILE