The MiniXP project is based on Dietmar Stoelting’s XPSP1 with full commandline and NTFS below 10 MB.
See here for the project homepage. Please refer also to the XPSP1 with full commandline thread (see link above). This project is a WinBuilder wrapper for one of the XP project’s discussed in the XPSP1 with full commandline thread. It can be used to create a small Windows XP based installation that can be booted from a physical hard disk or a hard disk image file – RAM disks and file backed disks are supported.