This is the homepage for the MiniXP Winbuilder project - a project based on Dietmar Stoelting's "XPSP1 with full commandline and NTFS below 10 MB".
MiniXP can be installed to a hard disk and used just like a normal Windows XP, albeit with a much smaller footprint. The core files are just 23.5 MB - this includes a command line user interface and diskpart.
MiniXP is a modular system. Any application compatible with Windows XP can theoretically be added to the MiniXP project. Please read the project documentation for more details.
There is a MiniXP discussion topic on the reboot.pro forum - http://reboot.pro/16765/. Feel free to post any feedback or questions.