Looked in the help file and it says default ZIP archival format is 'Deflate' so I'm going to give that a try and post back.   So here are the results since apparently nobody else had done this kind of testing before. I ended up doing the testing myself and figured out compatible settings for PokeMMO modding. -Archive Format: ZIP is the only one supported for modding -Compression Level: Any setting is ok, from lowest 'Store' all the way to Ultra -Compression Method: Deflate