Sorry for the dig, but is there any chance you're still interested in this?
ZerOHearth wrote:Any chance to repack files?
Repacking isn't necessary, simply extract the files to ".../SleepingDogs/Data/" and if the game can't find the BIG file then it'll load those instead. HUGE thanks to Chipicao for figuring that out.
However, the game crashes instantly with all of them except for CharactersHD and Animation since the unpacker doesn't assign names to vital files. If Ekey updates those unknown files then we could create mods for normal characters too!
Also, Howfie already created a texture extractor a long time ago. It's a standalone .exe though, maybe you could incorporate his code into your program to make the process more streamlined.
EDIT: Reading over this thread, it saddens me to see how much support there was for this earlier, and now absolutely nobody cares.