From TDN

Commands

Use the following commands to execute the Map2Dif.exe program.

map2dif [-v] [-p] [-s] [-l] [-h] [-g] [-e] [-n] [-o outputDirectory] [-t textureDirectory] file.map 

-v Print program version information 	
-p Include a preview bitmap in the interior file 	
-d Process only the detail specified on the command line 	
-l Process as a low detail shape (implies -d) 	
-h Process for final build (exhaustive BSP search) 	
-g Generate navigation graph info 	
-e Do extrusion test 	
-n Noisy error/statistic reporting 	
-s Don't search for textures in parent dir. 	
-q <1,2> Parse Quake map file, version 1 or 2 	
-o dir Directory in which to place the .dif file 	
-t dir Location of textures 	
file.map The map file being converted