I don't understand "back to". If the first thing the CD/DVD boots (the El Torito boot image, as specified in whatever .ISO or CD/DVD building program you are using) is ISOLINUX, then why would you be going "back to" GRUB4DOS? Or are you building the CD/DVD so that it boots GRUB4DOS first?
...I am going to place grub.exe somewhere in my DVD_root folder and then enter the following item into my isolinux.cfg file:LABEL grub MENU LABEL back to Grub4dos loader KERNEL /boot/grub/grub.exe
I also don't understand why booting GRUB.EXE didn't work for you. I'm pretty sure that's what I boot with Syslinux every time I do Syslinux -> GRUB4DOS.
Huh? You just said isolinux.cfg file. What menu.lst? ISOLINUX uses ISOLINUX.CFG. GRUB4DOS uses MENU.LST.
Grub should than load this menu.lst??
While that is good news for you, I'm sorry that your solution uses GRUB4DOS but the thread is in the Syslinux forum.
Update: WOOHOO I got it!!
- Readers mightn't find it
- Readers mightn't find it relevant to Syslinux
- I don't know why the ISOLINUX + chain.c32 method failed to chain BOOTMGR, but perhaps it's an opportunity to fix a bug
Heheheh. Hopefully you are very lucky and do not discover that either of those PEs require any files inside the .ISOs they are booted from, after they've been booted. Hopefully they have everything they need within their .WIM files.
I will refine my methods and learn more about GRUB4DOS than post my final result. Big thank you to Wanko and Sha0!