Once made (install onto fresh USB FLASH drive (Vista+ OS installs will not work if on an HDD) and then install grub4dos using latest RMPrepUSB), the following Optional files can be added:
Add XP Pro and Home SP2 and SP3 install ISOs to \_ISO\Windows\XP folder to install XP
Add Vista 32 and 64 ISOs to \_ISO\Windows\Vista folder to install Vista
Add Win7 32&64 generic&Enterprise ISOs to \_ISO\Windows\Win7 folder
Add SVR2K8R2 ISOs to \_ISO\Windows\SVR2K8R2 folder
Add Win8 32&64 generic&Enterprise ISOs to \_ISO\Windows\Win8 folder - for generic ISO, you will be asked if you want Consumer or Pro and a dummy Product key will be provided or you can enter your own key.
Add SVR2012 ISOs to \_ISO\Windows\SVR2012 folder - not yet tested as I don't have a full copy!
In addition, if you have clonezilla, acronis rescue, Kasperksy, UBCD etc. ISO files - just copy these and any other LiveCD ISOs you fancy into the \_ISO\AUTOISO folder.
You can still add .mnu files in the same way as before.
Make sure to run WinContig to make the ISOs contiguous (use RMPrepUSB - Ctrl+F2).
Feedback welcome - I have not yet tested the following ISOs:
XP SP2
Win7 64
Win7 ent
Win8 64
Win8 ent
SVR2K8R2
SVR2012
I have tested
XP SP3
Vista 32 SP1
Win7 32 SP1
Win 8 32 (Consumer+Pro)
clonezilla, acronis rescue, Kasperksy, UBCD ISOs (just copy into AUTOISO folder)
memtest86+, freedos fdd image
Follow it's development on the reboot.pro forum here.