This program boots the install bootmgr/ntldr for any given ISO file. Make a multiboot windows USB key with Syslinux and FiraDisk. Put one key in your pocket and install multiple versions of windows anywhere. Formats with NTFS.
Note: stored iso files must be contiguious...
Try any fragmentation program. zzz.
Example:
1. copy a large file then delete it from usb.- leave space.
2. run the entire fragmentation process.
3. edit menu.lst in /boot/grub (rename previous iso)
4...