If you have NewWadTool v1.3 or higher for Doom then type in at the Doom prompt:
nwt -merge bunny.wad

Then type:
doom -file bunny.wad
 
If you don't have NewWadTool for Doom then you can't expirience the greatest 
Doom add-on EVER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!




