There is only one file type that uses the .LIZD extension:
Live Interior 3D Compressed Document
Compressed interior design project file created by Live Interior 3D home and interior design software; saves the compressed version of a .LI3D document; used for reducing the storage size of projects for emailing and archiving.
Live Interior 3D for Mac was succeeded by Live Home 3D for Mac. LIZD files are still supported by Live Home 3D for Mac.
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Updated: April 20, 2017