The gkp file extension is mainly related to GameKeyboard, a gamepad like environment for Android smart phones used to play video games. These files look like some sort of profile or setting which is loaded to the app.
How to open:
You can load up these files to GamerKeyboard app.
How to convert:
As far as we know, this .gkp file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.