Hey guys. Ive made a song on guitar pro 4 and i want to show people on this site to see if it's any good. So can anyone tell me how to attatch a guitar pro 4 file so others can see it?

I tried clicking the manage attachments and tried clicking upload once i'd found the file. But it comes up with invalid file. Can anyone help?
If your on Windows XP right click on the GP4 file and got to 'send to' and click 'Compressed Zipped File' and it should create a new .zip file with the GP4 file in it