Could not patch WIM?

[2Shirt]

DEAR PEOPLE FROM THE FUTURE

The solution for me was to use DISM to export a new copy of the WIM file.

My original issue was the same as this thread http://forum.ipxe.org/showthread.php?tid=7987 Thinking I knew better I used wimlib-imagex to export a new wim file with max compression. This resulted in the "Could not patch WIM" error from the first post of this thread. When I added rawwim to the cmdline I got the "no bootmgr.exe" error. When I added a initrd option for bootmgr.exe then Windows would crash with a winload error of 0xc0000225. After too much time changing wimboot options I re-exported a new WIM using DISM this time. The new WIM booted normally and didn't need the bootmgr.exe entry so I removed it.

The boot files I used are from a Win10XPE generated ISO which is very similar to WinPESE referenced before. Hope this helps.