The Sith Engine represented LucasArts' first foray into 3D gaming and was designed as the successor to the Jedi Engine used in Dark Forces. Sith was originally created to power Jedi Knight but it was later extended and reused for Mysteries of the Sith, Star Wars: Droidworks, Indiana Jones and the Infernal Machine and Grim Fandango.
The Sith 2 Project is an attempt to recreate the Sith Engine with support for current hardware and more advanced features.
The Sith engine uses a variety of proprietary (and a few common) formats for storing it's resource files. Luckily most of these are plaintext and are easily deciphered.
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