anchor.diff:  :pwad_nerve
   REM --------------------------------------------------------------------------------------------------------------------
   REM # are we looking for "No Rest for the Living"?
  -IF NOT /I "%PWAD%" == "NERVE.WAD" GOTO :pwad_master
  +IF /I NOT "%PWAD%" == "NERVE.WAD" GOTO :pwad_master
   	
   REM # is Steam : DOOM 3 BFG Edition installed?
   CALL :reg "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Steam App 208200" "InstallLocation"
  
positive.code: :iwad_doom2
  REM --------------------------------------------------------------------------------------------------------------------
  REM # are we looking for "DOOM II"?
  IF NOT /I "%IWAD%" == "DOOM2.WAD" GOTO :iwad_tnt
  
  REM # is Steam : DOOM II installed?
  CALL :reg "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Steam App 2300" "InstallLocation"
  
negative.code: :iwad_tnt
  REM --------------------------------------------------------------------------------------------------------------------
  REM # are we looking for "Final DOOM: Evilution"?
  IF /I NOT "%IWAD%" == "TNT.WAD" GOTO :iwad_plutonia
  	
  REM # is Steam : Final DOOM installed?
  CALL :reg "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Steam App 2290" "InstallLocation"
  