If you have trouble getting Thief 3 to work on your widescreen machine you may want to try this new patch, which provides an all-in-one solution:

  • All resolutions reported by the system are available from the options screen.
  • No issues with 16:9 modes
  • Field-of-view is adjusted for widescreen for both OMs and FMs
  • The HUD and menus are shown correctly, regardless of resolution and aspect ratio
  • Has been reported to work in 3-monitor and 3D display modes
  • Includes a fix for multicore machines
  • Easy-to-use installer
  • GUI tweaks, e.g. HUD scaling and mirroring

Full description and download links here. If you have questions or feedback, please post in that thread.