ability to configure path to output file

[gieseanw]

Right now it's hard coded to Environment.SpecialFolder.ApplicationData. I'd like to be able to change where it writes to.

[gieseanw]

For a first iteration, it may be easier to have it first search for a special environment variable that signifies the directory to write to, or perhaps a registry entry (that way no need for UI elements). Otherwise it could default to the ApplicationData folder.