I had PowerTab on my computer, then downloaded TuxGuitar. I didn't like it, so I uninstalled it. But now my computer won't recognize .PTB files so I can't use PowerTab.

How do I fix it?
Right click a .ptb file<open with<choose program< and look for powertab in the list.
If it isn't there, click browse<Go to program files in the window, click on the powertab EXE, which should be in the powertab folder.
It kinda works now..but I have to save every PowerTab file I want to use now instead of just opening it without saving it to my computer.