There is only one file type that uses the .TGD extension:
Terragen Project File
Project created by Terragen, a landscape and animation generation program; contains objects, terrain, shaders, water, atmosphere, lighting, camera angles, and node network elements that make up the landscape scenes created by Terragen.
To create a TGD file, select, name your file, choose your save location, verify that the File Format is TGD, and click .
To open a TGD file, simply double-click the file. You can also select, navigate to the TGD file, and click .
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Updated: May 27, 2014