Currently, game project files can only pass from Windows to Mac, not the other way around. We've already worked out a solution to this issue and it will be included with GameSalad 0.9.93 for Mac, expected to launch very soon.
Actually I can open mac gs file on windows. In 9.93 and 9.94, when i save a file. It saves as .gameproj. When i transfer that file over to a windows machine and open it, inside there is a .gsproj file which can be open on windows creator.
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And i receive an email from gamesalad yesterday.