MS has really got me confused ! There is no actual Dos under XP as we all well know, but the implementation of a command window gets more extensive with every issue of Windows - as witness the ROBOCOPY command in Vista !! Now my problem is - where the heck is the PATH property specified ? When I open a command window which is running cmd.exe in System32, there is a long path name there already, with things added by certain installed programs, like (would you believe) quicktime. In addition to which I have found there is an AUTOEXEC.NT file in SYSTEM32 and an AUTOEXEC.DOS in C:\ Neither of those has a PATH line in them. If I open Control panel / system advanced tab and click the 'environment variables' button, there is a Path variable there, but by experiment, all it does is it ADDS to the path already present in any command windows EXCEPT a window which runs command.com instead of cmd.exe More and more confusing - two command language processors, and at least three places where a Path can appear, one of which - the most important - I cannot even find ! I would at this point say I need both of the command processors, because there are certain 16-bit programms I like to run occasionally which will work fine under command.com, but do nothing under cmd.exe.... I would love it if someone could point me to a tutorial on 'dos in windows XP'