Posted June 09, 2013
Grab this ZIP-file: 
 
https://github.com/vbigiani/widescreen/archive/master.zip
 
Grab a copy of WeiDu:
 
http://www.weidu.org/~thebigg/
http://www.weidu.org/~thebigg/WeiDU-Windows-231.zip (Windows Binary)
 
Extract the master.zip archive and put the "widescreen" folder on your desktop.
Extract WeiDu.exe from WeiDU-Windows-231.zip, to your desktop and rename it Setup-widescreen.exe.
 
In Planescape, uninstall GhostDog's PST GUI mod, and your current Widescreen mod. Remove the current widescreen mod installation files and put the ones you just extracted / renamed in their place.
 
Re-install the widescreen mod and Ghostdog's GUI.
 
Caveat: I have not tested this on games in progress, but if you do, I recommend choosing the same resolutions as you did when you first installed the widescreen mod. Choosing other resolutions may break your game. I would actually recommend not to mess with mods in mid-game, and do it only if you actually can't continue.
https://github.com/vbigiani/widescreen/archive/master.zip
Grab a copy of WeiDu:
http://www.weidu.org/~thebigg/
http://www.weidu.org/~thebigg/WeiDU-Windows-231.zip (Windows Binary)
Extract the master.zip archive and put the "widescreen" folder on your desktop.
Extract WeiDu.exe from WeiDU-Windows-231.zip, to your desktop and rename it Setup-widescreen.exe.
In Planescape, uninstall GhostDog's PST GUI mod, and your current Widescreen mod. Remove the current widescreen mod installation files and put the ones you just extracted / renamed in their place.
Re-install the widescreen mod and Ghostdog's GUI.
Caveat: I have not tested this on games in progress, but if you do, I recommend choosing the same resolutions as you did when you first installed the widescreen mod. Choosing other resolutions may break your game. I would actually recommend not to mess with mods in mid-game, and do it only if you actually can't continue.