A Vortex GoldenGate card (not the GoldenGate+ - that's from another company) would also allow you to transfer files using a normal ISA network card. Provided you set it up in DOS and are prepared to type some CLI/DOS commands every time
But as well as being fiddly it's going to cost you more than a regular Amiga network card...
An external IDE->CF adapter and a card reader for your PC would be a lot cheaper. I'm sure alexh posted a link to one the other day that was fitted into a backplane slot?