There is only one file type that uses the .TGP extension:
A TGP file is a plugin used by Terragen Classic, a photorealistic natural scenery generation program. It contains a plugin, which includes information that extends the capabilities of Terragen when installed. TGP files are used to add a variety of features to Terragen, such as camera effects and new landscapes.
If you want to install a TGP plugin, place it in the Terragen\Plugins directory. When you restart Terragen, the plugin is automatically loaded.
NOTE: The TGP file was used by Terragen Classic, which is now discontinued. Terragen Classic will only run on Microsoft Windows XP, ME, 2000, Vista, 7, and 8.
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Updated: May 21, 2017