OK the theory here is actually VERY simple. In all actuallity the process is exactly the same. Place the WPI folder the root. then put the $oem$ folder at the root also, Win2000, XP and 2003 will all use this $oem$-cmdlines the same. That way you only need 1 set of files for all those OS's and their variations. As for Windows Vista and 7 Each one would need a setupcomplete.cmd at the location of: ...\Sources\$oem$\$$\setup\scripts (VERY Small file) You can get this from the downloads section. NOW that WPI is at 1 central location and all the OS's have the proper start files you can decide if you want to use the Multi-defs or the switches to use a special WPI setup for each OS without the need for several WPI folders