Right click MoneroX > Show Package Contents > Contents > MacOS > Right click Launcher.exec > Open
Sorry for all the inconvenience caused! It turns out that zipping files on Mac OS X causes file permissions to be written inside the archive, and thus, not letting users to open the the zip file containing the Mono bundle.
I've re-uploaded 'MoneroGui.Net-v1.2.0-Mac-x64.zip' to GitHub, as the new file should solve these Mac-related problems.
P.S.: Also, please make sure - whether you're using Mac OS X 10.9.5 or higher - that running unsigned applications is allowed.
Still can't get it to run. Shouldn't that be "Launcher" rather than "Launcher.exec"?
No. By the way, you should just simply try running the .app file directly, and all the magic should happen in the background.
When I open package contents and right click Launcher.exec to open it I'm getting "There is no application set to open the document “Launcher.exec”.