OpenInEditor.lock

[Slasher]

Have recently seen this file now in games folder...

_OpenInEditor.lock

[Gilbert]

It's probably just a temporary file created while a game is being edited. I've tried opening a game in the editor and yes, a file with such name was created, and it simply went away off after I closed the editor.
If you encounter some problems while editing a game, like the editor crashing, for example, it is possible that the file would stay without being deleted as normal. I think it may be safe to delete it, but if it's not causing any troubles I don't see any need to care about it (it will probably be removed normally when you edit the game again and close the editor successfully).

[Slasher]

Thanks Iceboty V7000a

The game itself seems to be running ok.

I'll leave it if it still shows.

cheers