You might want to try this:
http://www.winimage.com/
It creates raw disk images that are inherently readable by just about anything (anything that can read standard floppies). However, you'll probably either have to write them back on to floppy in order to use them or find a second program to mount them as virtual floppies. I know of one or two programs that do the latter for CD-ROMs but none for floppies (at least, outside a full PC emulation environment. PC emulators, such as VMWare and Connectix Virtual PC have the ability to read and write raw images built in).
If you don't want to spend a lot of money (WinImage costs USD$30.00) then tools like rawrite and rawread (which are primarily for DOS/Unix but Win32 versions do exist) will do the simple job of reading raw and writing raw images to and from floppies but lack capabilites like creating blank images and allowing you to add and remove files from them. Linux has much of this stuff built in but installing a whole new OS just to back up some old games is probably overkill...
Wasurenaide...
...watashi ga iru koto o.
Itsudatte soba ni iru yo.
Gentoo. Because everything else is just shit. 😁
Registered Linux user #319839