Sorry to necro this thread, but I wanted to share a result: I was following the procedure of zipping the files, not the folder with 7-Zip and changing the extension of the resulting archive from .zip to .mod, and then not seeing the module show up on FG reload. The solution that I found was in my 7-zip settings. I changed the compression level from Ultra to Normal and the algorithm from Deflate to Bzip2, and then the resulting .zip file loaded in FG correctly. Earlier comments regarding the .zip settings being off are correct, but now we have specific settings that work.