There is only one file type that uses the .LH3D extension:
Live Home 3D Project
An LH3D file is a project created by Live Home 3D, an app used to design and visualize the interior and exterior of a home. It contains a project, which includes floor plans, building materials, lighting designs, fixtures, and furniture. LH3D files allow users to close a design and reopen it for further editing at a later time.
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Updated: September 6, 2019