An FRW file is a data file used by RollerCoaster Tycoon 3 (RCT3), a theme park simulation game developed by Atari. It stores properties of fireworks effects, which include the number of particles, burn size, sound effects, and color of fireworks in the game. FRW files are used for a variety of firework types, such as blue fire flares, blue thunder, fire flies, red dawn, star burst, and spiral fountain.

FRW files are included with the game but may also be created by RCT3 gamers. To install custom FRW files, place them in the following directory: C:\Program Files (Program Files(x86)\Atari\RollerCoaster Tycoon 3\Fireworks After placing them in the "Fireworks" folder, the fireworks in the FRW files will be listed under Fireworks in the game.