Just tried my game on OSX and it doesn't work with this plugin. It does work perfectly if I don't add this plugin, though.
I've tried both NW.js: 0.15 (with Steamworks SDK: 1.36) and NW.js: 0.14.7 (with Steamworks SDK: 1.37). I get an error about resources. Searched online and found this thread https://github.com/nwjs/nw.js/issues/3307 which mentions it should be fixed by now, but it doesn't for me. Using "--file-descriptor-limit=10000" in the launch options for my game on steam also doesn't fix it.
I'm open to ideas. <img src="{SMILIES_PATH}/icon_e_sad.gif" alt=":(" title="Sad">
Resource error on OSX has nothing to do with Steam plugins. I got the same one without Greenworks or any other plugin. I tried different solutions but ended by removing Mac support from the description of my game. There are only about 3% Mac users on Steam so it shouldn't be a big deal.