.PI4 File Extension
File TypeDEGAS Image
What is a PI4 file?
Bitmap image created by DEGAS, an early image-editing application for the Atari ST systems; supports color images; can still be opened with the XnView image viewing program and converted to more common image types.
The Atari ST was a computer system that was popular in the late 1980s and early 1990s. It was discontinued in 1993.