How can I open Rui wa Tomo o Yobu files in GARbro

[Ikkfes]

On the supported formats page of the GitHub it has  Rui wa Yomo o Yobu listened as one of the titles that this tool supports but I still can't open it. When i throw the data.xp3 it says that the content could be encrypted so I select "Rui wa tomo o Yobu" as the encryption scheme and i shows : CxEncryption(0x2E4, 0xc7) but when I click to open the file it still shows "file could not be opened as a resource archieve".