[opelfruitcase]

AFAIK, you can't gain direct write access to any hardware under NT-based Windows kernels (including direct access to the BIOS) so can't see how any utility like this would work.

However, I can suggest that XP does indeed allow you to create an MS-DOS boot disk under XP - simply go to format the floppy from Windows Explorer context menu in the normal way, and there should be an option there to create an MS-DOS start up disk.