Since Pad Files are XML based files, they are easy to extend to contain other data without effecting whether applications can read them.

This also means that a Pad Creation program can easily be written to read in from a html file the questions to be asked, and how to save those results in the resulting pad file.

Thus when you see a pad file extension on the net, they will take the form of html text to be saved to your PadGen directory. This can be a little confusing if you do not understand what you are meant to be doing with them!

For the latest pad file extensions look here