anchor.diff:  	)
   )
   
  -IF EXIST "%IWADS%\%IWAD%" (
  -	REM # the IWAD exists as-is and requires no special provisions
  -	SET PARAMS=%PARAMS% -iwad "%FIX_PATH%\%IWADS%\%IWAD%"
  -	ECHO         -iwad : %IWADS%\%IWAD%
  -	REM # skip ahead, no edge-cases to handle
  -	GOTO :params
  -)
  +REM # this is where the IWAD is assumed to be
  +SET "IWAD_PATH=%IWADS%\%IWAD%"
  +REM # the IWAD exists as-is and requires no special provisions,
  +REM # skip ahead; no edge-cases to handle
  +IF EXIST "%IWAD_PATH%" GOTO :iwad_found
   
   REM # IWAD is missing,
   REM # now search GOG / Steam for the IWAD:
  -SET "IWAD_PATH="
   
   :iwad_doomu
   REM --------------------------------------------------------------------------------------------------------------------
   REM # are we looking for "The Ultimate DOOM"?
  +REM # (if not, skip ahead to DOOM II)
   IF /I NOT "%IWAD%" == "DOOM.WAD" GOTO :iwad_doom2
   
   REM # is Steam : The Ultimate DOOM installed?
  
positive.code: :iwad_shareware
  REM # if the user is trying to play just DOOM as-is without a PWAD,
  REM # then the best thing to do is offer them the shareware version:
  IF /I "%SAVE_WAD%" == "DOOM" (
  	ECHO:
  	ECHO   WARNING! Could not find registered DOOM.WAD:
  	ECHO:
  
negative.code: 	
  	REM # we keep %SAVE_WAD% as "DOOM" so that save games from
  	REM # shareware DOOM can be re-used in the full game
  	SET "IWAD_PATH=SHAREWARE\DOOM1.WAD"
  	
  	GOTO :iwad_found
  )
  