REJECT.EXE v1.1 is a command line based utility used for building the 
REJECT resource in a DOOM or DOOM 2 PWAD file. It post-processes a 
PWAD which has been created using a level editor such as DEU. Its main 
purpose is to speed up slow PWAD files by reducing the number of 
line-of-sight calculations performed by the DOOM engine. 

REJECT.EXE is freeware.

*** Now Supports DOOM 2 WAD files ***