This is version 2.03 of Command & Conquer: Tiberian Sun (with the Firestorm expansion pack) and is a direct copy of the installation from the Command & Conquer: The First Decade compilation. The game was released as freeware by Electronic Arts in February 2010, courtesy of then-community manager Aaron "APOC" Kaufman.
This is the complete Command and Conquer: Tiberian Sun game, including the Firestorm expansion pack. This release is compatible in online play with both XWIS and CnCNet.
To install, extract the archive to Program Files, then run tibsun_regadd.reg. If you are more knowledgeable about editing registry files, you can change the mentioned file to refer to a game directory of your liking, and then run it.