Isaku and shuusaku .mes file extraction error

[HOKORISAMA]

Hi bro, I was trying to unpack isaku game with tool and I successfully unpacked the message.arc with AI5WINARCTOOL but when I tried to unpack .mes files that I got form .arc file it gave me a error like illegal multiple bytes in position 0x9e somthing like that, I have tried both the original isaku and isaku renewal but the result was same.

Could you please look into the issue.

Also I tried to unpack shuusaku with both AI5WINARCTOOL AND AI6WINARCTOOL but nothing worked and while scrolling through the issues I found your comments to AIWINTOOL for shuusaku but still even the unpacking of .arc file was a success there isn't any tool available for .mes file extraction.

Could you do something about this as well.

Thank you.