adespoton wrote:-39 eof "Err End of file; no additional data in the format"
It usually occurs when the resource fork can't be read, which happens when the fork's been stripped out transferring to a non-HFS filesystem and back. It also can happen when attempting to run software from the host's shared folder, as SheepShaver only sees the data fork sometimes.
Thanks. That helped me solve the problem. I was moving the games from the DSK image under Mini vMac into the macOS Unix drive, then moving them into the DMG image used by SheepShaver. This was obviously stripping out the resource forks. By mounting the DSK image under SheepShaver and copying the game folders directly across to the DMG image within SheepShaver, the transfer worked properly and the games launch successfully.
I have previously had no problems with moving files from the Unix drive straight into DMGs under SheepShaver, but this was the first time I tried moving something back from the Mini vMac images to SheepShaver. There must be something about the older HFS formatting on the DSK image (required for Mini vMac compatibility) that causes a problem going back from that format into the Unix/macOS file structure.