Well, now we can get a little dirty with this, first, have you tried mounting it using linuxconf? I've done it this way successfully with a win98 / rh7 system.
You just have to select the partition (which is now named in the proper linux fashion, hda1, hda2...etc). If you know which it is (most likely the existing partition that isn't currently mounted
) then you can just go into linuxconf and add a local drive with the VFAT type. Give it a shot...