Every time I’m importing this extension, I can see “GMLive - Copy.gml” file under scripts, is this some hidden file in extension, or it’s some GM bug/feature that causes to create this file?

Seems that after last release I also can see “GMLive.gml._” which is empty…

In my case I get this if I'm converting a 2.2 project that has GMLive extension, to 2.3

 Removing GMLive (all of its components e.g objects, scripts, extension packages, etc) on that 2.2 before converting to 2.3 fixes this ghost file existence.

Apparently GameMaker packs up any unrelated files from asset directories when creating an extension, so occasionally some random test files slip in.