A GP3 file is used by the musical composition program Guitar Pro 3.
This software is primarily used for guitar, but also works with other stringed instruments (namely the plucked ones) such as the banjo. These files can be played back or printed.
.gp3 File Extension
Developer:
Arobas Music
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Vad är en gp3-fil & hur man öppnar den - Guitar Pro 3 Project File
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Utvecklare:
Arobas Music