Notes:Nancy Drew: Curse of Blackmoor Manor (PC)

avf files
The avf files found with the bik files are apparently very proprietary and only viewable with the game. You can still see avf files not normally viewed by using it to replace an avf file that is used. For example, I got the screenshot for  by replacing   with it (since that puzzle is immediately accessible from a new game). Needless to say, keep backups of files you're replacing.

The bik files, on the other hand, can be viewed by anything that uses ffmpeg's stuff.

his files
The ironically-named HIS files are really just Ogg Vorbis files with a her-specific header. Most of the tools I tried wouldn't play it, except ogg123, which will play them as-is.

To make them suitable for TCRF, you need to run them through an oggdec/oggenc combo (make sure you set the quality level for oggenc, the default value is 3(!)). Manually removing the her-specific header only causes the file to be unreadable by everything, including ogg123.

ogg123, oggenc, and oggdec are available from vorbis-tools if you don't have them.

Debug mode
There is a key combo that unlocks it, though I have no clue as to what it might be.

Although there's a  option in Game.ini, it's the only one of the Game.ini options that can't be found in Game.exe, leading me to believe it's been dummied out. Prove me wrong though :).

As a final hint, I distinctly remember the debug mode appearing in a window similar in appearance to the conversation windows in the game.

Corrupted Sound files
So far, I've found these files to be corrupted, looking at them with a hex viewer shows the Ogg header doesn't (seem to) exist:

switch_on_organ.HIS switch_off_organ.HIS BallHit_Billiard.HIS

The organ sounds likely refer to the carousel organ from Nancy Drew: The Haunted Carousel. No idea where the billiard sound would've happened, though it's important to remember that there is no billiards game in any of the preceding games, meaning the sound, if ever used, isn't in the most immediately obvious place.