I've tried transferring all sorts of files .sit, .bin, .sea etc. None are recognized, all end up being identified as "document" once transferred. I'm using system 4.1 on the 512k so you can't drag and drop. Unfortunately I don't have Stuffit on disk for the 512k. All I have in terms of storage on the 512k is the internal 400k drive and an external 400k drive. My plan was to boot the machine from the internal floppy with MacTerminal 1.1 on the disk, then I could transfer up to 400k to the external drive. It would work great if I could just transfer the files without the dreaded resource fork becoming screwed.
One other thing I have tried is to transfer the files from Basilisk II on the pc. I have Basilisk II running system 7 on the pc and I can transfer files from that but the problem is the same once they hit the 512k. What I could also do is set up an Appletalk network between Basilisk II and the 512k, but I still need to get the Appleshare disk over to the 512k. It's a bit of a catch 22.