If anyone finds those .gpk or .mrk files annoying you can create a CMD script to quickly and easily delete them.
del “E:\FOLDER NAME*gpk” /s/f/q
del “E:\FOLDER*mrk” /s/f/q
Change E: to the drive where your folder exists.
Delete either line of code if you don’t want that extension deleted.
File Save As whateverfilenameyouwant.cmd
(must have the .cmd extension added)
Right-click the CMD file and run as administrator.