Mac users have 2 options when it comes to Power Tab files.

1) TabView makes it possible to view and print PowerTab tablatures with your Mac. With TabView you can also export your tabs in MIDI format, or follow the playback on screen to help your learning process. TabView is an Universal Application, thus it runs natively both on Power PC and Intel based Macs. Download Tabview

2) Guitar Pro ($59) allows users to import Power Tab files using it’s import feature Download Guitar Pro.

Thanks!