Modding in the Ultimate HD Edition (Resident Evil 4)

and so I want to start making mods for this game for the Ultimate HD Edition 2014,

but the fact is that how I figured out the file format of this game is different

(before the file format was in the form of ARC files in games such as DMC4 DMC4SE RE 0 HD RE HD RE 5 RE 6 RE Revelations RE Revelations 2)

knowledgeable people tell me what programs are needed to unpack resources and texture editor