strixo: The weidu executable is the *.exe associated with whichever tweaks or mods you've installed. So it might be like bg2_tweaks-v9.exe (or whatver version). When you run a weidu executable, it backs up all the files it changes in the same-named directory (i.e. ..\bg2_tweaks\. Also, weidu.log is a notepad-readable file in your root game directory.
But honestly, I'd just uninstall it all and put it in c:\games\bgtutu, or wherever outside of program files. You're opening yourself to headaches running any games from program files(x86), and BG/weidus have had many problems there too.
edit: the bg2_tweaks*.exe should be sitting in your baldur's gate tutu directory. You can run it again and again do selectively choose which tweaks to install/unistall. Same with every other weidu tweak/mod, though order you install them can be important.
If I uninstall it all and start again, will I lose my current game?
I've found the WeiDU log - copied below:
// Log of Currently Installed WeiDU Mods
// The top of the file is the 'oldest' mod
// ~TP2_File~ #language_number #component_number // [Subcomponent Name -> ] Component Name [ : Version]
~EASYTUTUDEGREENIFIER.TP2~ #0 #0 // EasyTutu Degreenifier
~WIDESCREEN/WIDESCREEN.TP2~ #0 #0 // Widescreen Mod -> for the original Infinity Engine (CHOOSE THIS!): Widescreen Mod v3.02
~SETUP-EASYTUTUHOTFIXES.TP2~ #0 #0 // EasyTutu Hotfix: A64 Saves Beregost
~BG1UB/SETUP-BG1UB.TP2~ #0 #0 // Ice Island Level Two Restoration: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #1 // The Mysterious Vial: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #2 // Additional Elminster Encounter: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #3 // Angelo Notices Shar-teel: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #4 // Finishable Kagain Caravan Quest: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #5 // Coran and the Wyverns: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #6 // Kivan and Tazok: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #7 // Branwen and Tranzig: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #8 // Safana the Flirt: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #9 // Appropriate Albert and Rufie Reward: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #10 // Place Entar Silvershield in His Home: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #11 // Scar and the Sashenstar's Daughter: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #12 // Quoningar, the Cleric: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #13 // Shilo Chen and the Ogre-Magi: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #14 // Edie, the Merchant League Applicant: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #15 // Flaming Fist Mercenary Reinforcements: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #16 // Creature Corrections: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #17 // Creature Restorations: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #18 // Creature Name Restorations: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #19 // Minor Dialogue Restorations: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #20 // Audio Restorations: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #21 // Store, Tavern and Inn Fixes and Restorations: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #22 // Item Corrections and Restorations: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #23 // Area Corrections and Restorations: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #24 // Permanent Corpses: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #25 // Elven Charm and Sleep Racial Resistance: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #26 // The Original Saga Music Playlist Corrections: v12
~BG1UB/SETUP-BG1UB.TP2~ #0 #27 // Sarevok's Diary Corrections: v12
HTH and thanks again