I'd like to confirm that --biff command works fine now for PVRZ files. There may be still a little problem with the weidu code releted to --unbiff command:
[C:\Program Files (x86)\BeamDog\Games\00766/DATA/AREA0900.BIF] 58512 bytes, 0 files, 1 tilesets
ERROR: BIFF [C:\Program Files (x86)\BeamDog\Games\00766/DATA/AREA0900.BIF] has tileset entries 0--0, cannot extract tileset at entry 0 (this BIFF and your KEY file don't match)
[AR0900N.TIS] --biff-get error: Failure("invalid biff tileset entry")
Every single resource can be unbiffed, but AR0900N.TIS ends up corrupted (0 kb). It can be viewed in NI, so the biff file is not corrupted. Not sure about that chitin.key information, but if NI can see it than it is there, right? Please check it on the latest BG:EE 1.3 patch release, as I'm not sure if this was the case for older versions, and it looks like all files have been rebiffed in 1.3 patch.