There is only one file type that uses the .LWD extension:
Lightworks Data File
File used by Lightworks; a video editing application; contains data that is referenced by the application in order to operate; includes codec, video effects, and driver information.
LWD file are located in the following directory:
They're also found in the "DSX" folder inside the "Lightworks" folder.
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Updated: November 21, 2013