Files that contain the .gp3 file extension are usually used by the Guitar Pro 3 software application. Guitar Pro 3 allows for the editing of guitar and bass tablature files and the creation of scores for stringed instruments, such as the bass and the guitar.
The music files that are created and saved by the Guitar Pro 3 software are saved with the .gp3 file extension. While the files contain scores that are used to create music, the files do not contain any actual audio data in and of themselves.
The Harmony Assistant, Posix, KGuitar, Guitar Pro OS X, Guitar Pro and Guitar Pro Linux are all applications that can import GP3 files for use with the applications.
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If you have additional information about the GP3 file format or software that uses files with the GP3 suffix, please do get in touch - we would love hearing from you.