Just Buttons BTN
Just Buttons .BTN format (spelled JustButtons in some format lists) is an animated image / template / project file format associated with the Just Buttons application by Lincoln Beach Software. The application makes button images for web pages.
More research is needed to understand what sort of data might be stored in a BTN file.
Some or all BTN Files have ASCII "
TPF0" at offset 12, though that's probably not a format signature.
- XnView - Can decode embedded bitmap images (if any)