In my case this was :

Version: 4.1.1.2154614
Platform: steam

-------------------------
Altered/Added files 3
bin\bg3.exe
Data\Localization\English_Animations.pak
Data\Localization\Voice.pak

-------------------------
Files in Mods folder 0

I tried 1) removing the files from the folder, then 2) verifying files (so they would be reinstalled).
The warning is still there.