There is only one file type that uses the .LI3D extension:
Live Interior 3D Document
Interior design project created by Live Interior 3D, a 3D home and interior design program for Mac; saves floor plans, lighting designs, furniture, and other home design information; can be rendered to high-quality and panoramic images.
Live Interior 3D software can export interior views to standard raster formats, such as .JPG, .TIFF, and .PNG.
NOTE: Live Interior 3D was succeeded by Live Home 3D. LI3D files are still supported by Live Home 3D.
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Updated: September 9, 2016