A LIGHTKEYFXT file contains a profile for a light fixture used by Lightkey, a professional program used to configure and control DMX-compatible lighting fixtures for various types of venues. It stores profile information, which includes the name and model of the light fixture, along with the number of channels the fixture uses, and the beam, pan, and tilt properties of the fixture. LIGHTKEYFXT files may also contain user-entered comments.

LIGHTKEYFXT file open in Monospace Lightkey 3 Lightkey fixtures are DMX-compatible devices (lights, fog machines, motors, and relays) that can be connected to a DMX controller and added to a lighting display. Fixture profiles are referenced by Lightkey, which allows the software to recognize what fixtures are controlled by which channels in the lighting display. To view fixtures in the Fixture Manager in Lightkey, select Lightkey → Manage Fixtures.... To import a LIGHTKEYFXT file in Lightkey, click the gear icon in the fixture library, then select Import Profile....