If i could find source code for some ".bif" file unpackers for Neverwinter Nights and KOTOR , there is a good chance i could then make a working unpacker for "the witcher"
I believe its just a case of knowing the new offsets and different encoding in which it uses as current .bif unpackers will not working properly.
try "bif rip" from: iamtk102.googlepages.com/home
no source code... but it unpacked the bif files for me??