Yeah, I had a similar experience except I wasn't installing BG2Tweaks I was just running the exe that drops the folder and tp2 etc. into my BG2 game folder.
The dos window opened, I told it Q and it closed. Then I noticed the lock file. I moved it away to a safe place.
Then I was running the Crossmod banter exe, not installing it mind you, just running the exe to drop everything into the game folder and it autostarted weidu too.
Except this time the only message it gave me was to hit enter to install the mod.
I've been up all night RE-installing the game from ground up and wasn't installing anything just yet - hadn't even gotten around to the BG2Fixpack yet and so I was afraid of actually installing the Crossmod pack if I hit enter.
Now, this probably would have just launched the tp2 and I could have selected "quit" from there, but I wasn't taking any chances.
Anyway, I hit the dread X to close the dos window - sorry, but I just couldn't see any other way out with installing something before I was ready.
So that produced my second lock file.
Am I right in assuming I can just delete these? So far I haven't actually installed anything yet.
for the record: I've never run multiple weidu setups over one another and garbled my tlk file (which as I understand it, is what this whole lock file is trying to prevent)
btw- thanks to many of the folks in this thread for some fine mods (and helpful tutorials too)