Quoting a bit from man pluginkit:
+ indicates that the user has elected to use the plug-in
- indicates that the user has elected to ignore the plug-in
! indicates that the user has elected to use the plug-in for debugger use
= indicates that the plug-in is superseded by another plug-in
? unknown user election state
P13N
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I would like to point out that Xcode 11.5 beta 3 ships with a template for file provider extensions on macOS. As described in my own question, - https://developer.apple.com/forums/thread/675686 I did not succeed yet in getting it running, though.
It looks like a lot of kids ended up in the wrong forum. This is a Q&A site for the developer community on the apple platform, not for user feedback of third-party app developers. These complaints will not get you anywhere. You have to contact the publisher of the game.