Opening gp3, gp4, gp5 and .gpx files is as easy as 2 clicks, once you have the necessary software downloaded and installed.
Files with the extension of gp3, gp4, gp5 and .gpx 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 GP7, 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.
We here at TheGuitarLesson.com use Guitar Pro on a daily basis, and recommend it to our students as well. One of the best things about the software is that loads of people use it, and they have created tens of thousands of gp3-5 files on all the songs you can imagine.
You can actually find and download the GP file to basically any song ever written in our free Guitar Pro tabs database. Just visit the link, search for whatever song you are interested in learning, and download it free of charge.
If you don't have the Guitar Pro 6 software yet, know that it is not a free program, but it's features and usefulness offset the $60 you need to pay for it. Also, if you are a Premium Member at TheGuitarLesson.com, you'll receive a 20% discount off of your purchase of Guitar Pro 6.