There is only one file type that uses the .THL extension:
Total 3D Home Design File
File created by Total 3D Home Design, a home planning and modeling program; contains the blueprint model of the customized house design; model data held in the file includes house levels, room layout, wall sections, measurements, and fence height.
|Individual Software Total 3D Home Design Deluxe||Commercial|
Updated: June 22, 2016