How to open Guitar Pro 3 project .gp3 files
Have you had trouble opening the gp3 file on your computer? What are gp3 files? We explain what they are and recommend software that we know will open them.
What is gp3 file?
Files with gp3 extension can mainly be found as projects created in Guitar Pro 3 software from Arobas Music.
Guitar Pro 3 project description
The gp3 file extension is associated with Guitar Pro 3, a multitrack editor of guitar and bass tablature, which allows you to create whole scores for guitar, bass or other stringed instruments in a few minutes.
The gp3 file stores audio project created in the Guitar Pro 3.
Guitar Pro 3 is multiplatform application that is distributed for Windows, Mac OS X (macOS) and Ubuntu. It is developed by the French company Arobas Music.
Suggested software to open gp3 file

Guitar Pro
A multi-track editor and music composer for guitars
There are other GP3 filename extensions with the same .gp3 suffix
gp3 - Gerber internal plane layer data
Files with gp3 file suffix are related to the Gerber internal plane layer data format used by Altium Designer.