A PAR file is an aircraft parameters file used by FMS (Flying-Model-Simulator), a flight simulation game for Windows. It saves the airplane geometry and physics properties such as mass, center of gravity, and inertia moments. PAR files are used for creating custom aircraft to fly in the game.

PAR files are one of several files that comprise the total aircraft data for the game. For example, there may be other 3D model files, texture bitmaps, and sounds.

Index file containing a group of parity volumes in a Parchive (or "parity volume set") archive; can be used to recover a file archive when one of the files contained in the archive is lost.

Part file created by Solid Edge, a program used to create 3D product designs; contains a part design, including geometry, appearance, and structural information; used to store part information in the product design process.

Solid Egde can simulate parts to study their performance before manufacturing them.