Update3:)
Ok, Decompression and Compression (proprietary Sort of LZWRW1SS, don't know it 100%, rebuilded whole Routine blindly as pure inMemory Version... lol) works now and is 100% deterministic, which means if you unpack, decrypt, pack encrypt a Save it will be 100% the same as before. It works for XBOX and PC-Saves(RLD Version's).
There is no Editor, its a purely decrypt-unpack/pack-encrypt Tool currently, so if you want edit something you have to use a Hexeditor.
I will release it soon by starting a new Thread for it, so that i can maintain better future Updates and Requests.