Many TrueFire lessons include Power Tab files which allow you to "see" and "hear" the tab played out. To use these files, you will need to install the Power Tab Editor on your Windows computer. We've included a Power Tab installer file on all disc which feature Power Tab, for more information about Power Tab and links to many killer Power Tab resources, visit www.power-tab.net. Power Tab Editor is free shareware thanks to Brad Larsen, who wrote it and shares it with players the world over. The version you are downloading is a complete editing system which allows you to create your own Power Tab from scratch. Power Tab is only available for Windows. Because of its powerful educational qualities, TrueFire is converting many of its tablature guides to the Power Tab format. To work with TrueFire lessons you will only need to use the playback features of the Power Tab Editor, which are very simple to master. 

Here's a quick tutorial: 
1 - Install the Power Tab Editor on your computer. Keep in mind that Power Tab plays the tablature and notation through your midi setup. Odds are good that it will work fine right after the install but you may have to tweak around with your midi setup until you hear the tab being played. Call your computer support folks if you need help in this area. 
2 - Double click on the Power Tab file that you want to work with and you'll see it load into Power Tab Editor. 
3 - Notice the player controls in the upper right hand corner of the upmost toolbar. Click on the play button and you should start to hear midi playback of the tab and see each tab notation highlight in red as its played - a "follow the bouncing ball" kind of thing. 
4 - To work with an example, click on the tab section that you would like to play (notice the blue marking) and then click the play button. Currently there is no looping feature but Version 2, which is due out very soon, will have many more useful playback features. Meanwhile, you will need to click stop and play manually as desired. 
5 - You may find it useful to slow down a section until you've got it nailed. To do this find the second button from the left on the bottom toolbar. It's marked with a quarter note and equal sign. Click on this button and use the drop down to slow down the beats per minute (BPM), then click OK and play the tab. We hope you'll find this tool as useful and educational as we do. Enjoy!

When i try to open a Power Tab file i get this error message 
 

Choose the secondoptions Select the program from a list

Click the browse button and look for the folder called PT Software or Power Tab Software. Make sure Always use the selected program to open this kind of file is Checked. 

Double click on the folder, now you will see a folder called PTEditor 

Double click on the PT Editor folder

Now double click on the file PTEditor 

It will take you back to the screen above and Power Tab Editor will be highlighted. Click ok and you are set!