Opening gp3, gp4, gp5 files is as easy as 2 clicks, once you have the necessary software downloaded and installed.
Files with the extension of gp3, gp4 and gp5 are all Guitar Pro files, and the numbering refers to the version of Guitar Pro they were originally created with. The present version of Guitar Pro is GP6, which is the most modern version of the guitar software to date.
Guitar Pro files are actually tablature files, since Guitar Pro is a multi-track music sheet editing program. It has the power not only to write music for any instrument you can imagine, but thanks to its realistic sound engine, it has the ability to playback the score as well.