Lightwave Object (version 6 and up)
LWO is an object file format used by LightWave. LightWave is a program used for 3-D modeling, animation, and rendering. LWO files contain objects stored as meshes, and include polygons, points, and surfaces that describe the model’s appearance. They also might reference image files for textures.
Learn more about .LWO files:
Learn more about LightWave on their website.
Search on IT Knowledge Exchange for .LWO-related questions.