SafeTech in v5 is an OnTime executable, you can't run it from DOS or some other OS, as it's built to run in OnTime itself.
You can use bootdisk.exe to write the OS image to a floppy or something though, then use that as a virtual image to boot off with a micro-linux boot kernel or something though?
there no safetech.exe the trick is to use floopy..
create virtual flopy disk (there many but one of it http://vfd.sourceforge.net/)
and using your Mcafee Endpoint Manager launch recovery tools to create safetech floopy..
then safe the floppy image and load it from usb.. from boot menu
that depand on what you;re using either syslinux or grub etc..
they have option to load your floopy..
Howeber i saw the issue ruuning floopy from usb is it's detect your usb as first drive and hardisk second which sometime bit troublesome..
hmm.. so I some how need the ability to from a WinPE 3.1 command line, launch the Safetech boot image.
I wonder if there is a command line based virtual floppy program that I can launch this from.
In my case i use syslinux and create multi bootable USB so from boot menu i choose either to boot to wintech or safetech..
If you're not familiar with syslinux then try check SARDU tool www.sarducd.it and check how they used syslinux.
You can then edit the syslinux boot menu to suit your USB requirement.