There is only one file type that uses the .LWX extension:
Lightwright Database File
An LWX file is a database created by Lightwright, a theatrical lighting spreadsheet and database application. It contains lighting unit data, such as the unit type, purpose, location, color, channel, dimmer, and circuit.
You most likely will not come across an LWX file unless you work in stage design. If you do need to open the file, Lightwright is the best option.
Lightwright is used on Broadway and other live entertainment venues by stage designers and electricians. The program allows them to record and organize data for installing and maintaining light installations.
Updated: June 3, 2017