Sorry, did you solve the problem?
2012: the clients need a lot of time to boot if there is no os-deployment for them - after that (about 1,5 minutes) they are continuing with booting the windows but there is no abortpxe.com loaded. thats annoying for the users to wait that long time (and most of them dont know, that they can abort that wds-search by pressing esc)
all of the files (abortpxe.com, pxeboot.com, pxeboot.n12 and so on) are listed in the right directories. Is there any setting that the clients are booting faster and load that abortpxe.com file?
I have exact the same problem!