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The file is a GPX file, some help?
I wrote it with Guitar Pro 6 for Guitar Pro 6, as I don't have any other software to test it on. I dunno what you are trying to use it with, but I can only troubleshoot with said program.
Really odd, I use TuxGuitar and it being an open source program it should work just fine. odd thing is all the other guitar pro programs make file in a format to its name E.G. Guitar Pro 4 .gp4 or Guitar Pro 5 .gp5. one would think that Guitar Pro 6 would make .gp6 files haha xD