Hi. i force a similar problem.
and i have to say, i am not an linux expert.
i use the fog server on a ubuntu machine and i modded the pxe menu to boot a hirensboot.

i can point on the boot.gz file which contains all dos programs, but when startig a test it asks to load a cd-rom driver.

today i found the isolinux.iso and cfg file. is the fog server able to list the isolinux.cfg file?

some help would be nice.