Split_WinISO by Chandra
Split_WinISO.exe can re-make a .ISO file and convert the large >4GB Install.wim or Install.ESD file(s) into smaller files for you.
It has also been written to interface with the Easy2Boot MPI Tool Kit (if it is placed in the MPI folder).
In addition to splitting large .wim/.esd files, it can also add the missing Windows 7 EFI boot file and modify the boot.wim file for automating Windows Setup using XML files (see here for more details).
The latest version is here.
Recommended for Easy2Boot (fastest!) - SanDisk Extreme SDCZ880-128G-G46