The UPF file extension is used by some Nokia phones for digital photos created by integrated camera. Probably similar to JPG format.
Settings file created by MicroStation, a 3D CAD modeling tool; saves user preferences such as hotkeys, workspace settings, and the settings specified in the Workspace ? Preferences dialog; enables preferences to be remembered.
CAD file created in the Unified Power Format (UPF), a format used for annotating an electrical power design; can save information for power sources, power controls, and protection mechanisms; enables a power design to be documented. The UPF standard was developed by Accellera but then given over to IEEE.