These two version are not identical. Question 1: Is there any functional difference between them? I am asking because I can ramboot "Universal" XP without boot.ini/ntldr/ntdetect.com, by using bootmgr/winload.exe. It works for versions up to and including Vista and makes no difference wether system32\winload.exe or system32\boot\winload.exe is used as osloader. Look here for wimbooting diskless xp; http://sanbarrow.com/phpBB2/viewtopic.php?t=1695 (faster network transfer because of high compression - 550 Mb >> 220 Mb) Question 2: Is there a known way of forcing winload.exe to read txtsetup.sif, as in PE. Question 3: Is winload.exe even supposed to handle NT5.x PE? You can sure enough set "winpe yes" in BCD, but the only effect is that systemdrive is mapped to X:\, with winload.exe still seeking after config\system without reading txtsetup.sif (and non-volatile hives loaded to ram). Joakim