I can't open them. I have stuffit expander which will unzip the files I ask it to, but it will not expand binary files, whether dropped into stuffit or double clicked. Are there any solutions?

Windows 7 64bit

Bin files are Apple Binary encoded, which is basically serially stuffing the data and resource forks into a single file. Expanding this on Windows would make no sense, as you'd end up with two broken file fragments -- Windows doesn't know how to handle a resource fork -- so Expander for Windows doesn't even try.

Better to expand it inside SheepShaver or HFV Explorer.

We've got a few other threads on here that go into more detail or provide you with methods to extract the two forks if you really want to do it.