Attached is the Ghostdogs_PST_UI_mod_v2.2 file for used with the Planescape Torment Mods guide found HERE.
This is a User Interface modification which in combination with Bigg's Widescreen Mod makes any resolution (except those below 800x480) viable for Planescape: Torment by changing a number of things in the user interface.
The Widescreen mod works well in Planescape: Torment, but unfortunately when you change the resolution, almost all of the UI elements and game effects are shown in the top-left area since they were set for the original 640x480 game resolution.
What this mod does is center all of these elements and enhance the UI with original game art to fit nicely with any resolution. Additionally, bigger fonts are available for those with relatively small monitors.