WinPE is super convenient. I've used to build Linux USB installers for PoS systems. Some of these systems used some kind of flashable custom keyboard that most

WinPE is super convenient. I've used to build Linux USB installers for PoS systems. Some of these systems used some kind of flashable custom keyboard that most of the time had to be programmed in place and the proprietary software ran on Windows. I've build a 100MB-ish image containing the current version of WinPE and the program along with its library dependencies. I think I had to download some kind of special blob to that Syslinux could load it into memory. I also remember booting a small WinPE ISO into the server virtual ISO ILO function to repair remote Windows servers on remote retail stores. Pretty much all the disk related stuff is included. That particular ISO had the proprietary drivers for the server raid controllers. Anyway very good stuff if you only need to run some old style software that doesn't require multitasking.