You've an unfortunate catch-22. Under 6, it is not possible to read a PC formatted disk without the installation (if it can be done, even) of PC Exchange. However, no PC will ever be able to format Mac DD floppies, which most likely are the type that the images are provided in.
A PC can, however, format a Mac HD floppy, with the help of third party software.
I will disclaim that I have not tested these utilities (I don't use my PCs very often, and they're networked to most of my machines anyways)...
Unfortunately there are no freeware apps I've found, but there's a title called "TransMac" which seems like it would do what you need, at least as far as mac-formatting a disk.
http://www.versiontracker.com/dyn/moreinfo/win/16901.
Good luck.