This is the same as the supp.img included on ftp.redhat.com's canonical
Red Hat 4.1 distribution. However, the supp.img and supplemental floppy
disk shipped with some Official Red Hat 4.1 box sets did not allow users
to set up DOS partitions for booting at install time (see the Red Hat
4.1 Errata for details). Ths supp.img here fixes this problem, but was
available too late to be included in those boxed sets which exhibt this
problem.