Oh, some of the emulators allow you to create a "shared folder" between the emulated OS and your host OS. At least, that's what I do with SheepShaver. Very easy to share files between the two!

Right, I thought I remembered such an editor from back in the day, for editing those patterns. When I was a kid I went all-out with ResEdit, inspecting every single resource in the System and Finder files (and pretty much every application/game I had) ... it was pretty fascinating how much stuff was so easily-editable! I renamed my Trash to "Incinerator" :)