Just FYI, there is an older version of CrossDos that does run quite nicely under 1.3. I have an original copy, and that's what I use for all my transfers between my PC and my A500. As I recall, this program was originally produced by Consultron sometime prior to the release of Workbench/Kickstart 2.0, and in a rare smart move by Commodore, they licensed it for inclusion in 2.0.
If anyone wants it, I can ADF it, zip it up and put it in the Zone sometime over the next day or two. Of course then you'll be faced with the classic "chicken and egg" problem of how to transfer it to a real Amiga, but the other tools mentioned earlier in this thread should handle that for you ... assuming you can figure out how to transfer THOSE onto your Amiga first.