TFix is an all-in-one fix pack for Thief and Thief Gold (apply & play, no other fixes are necessary). it uses NewDark, the latest update of the Dark Engine - this improves compatibility with new pcs significantly, fixes graphic issues, adds support for widescreen resolutions and much more (also installs overhauled maps and resources - see the notes, including the final one).

TFix 1.27c (TFix currently uses NewDark version 1.27)

Make sure to restart your current mission after patching (clicking the "restart" button in the save/load menu).