I think that was an appropriate response, and I was just about to ask you to cut it out.
1) If they're encrypting their data files even further than making their own archive format, they're doing it on purpose. They don't want it to be decrypted, and asking isn't going to change that.
2) The code mauve wrote was for the data file, not the exe. Furthermore, the data files aren't "encrypted" with MD5. MD5 is a hashing algorithm, which is strictly one-way, and generally can't be decrypted on its own.
3) There are english touhou fans, but not only are there significantly less and aren't the target audience, you can reasonably assume a majority of the people playing these games haven't actually purchased them. I seriously wouldn't want to cater to a group of people that pirated all my shit and then turned around and asked for more.
4) When you didn't receive any initial replies, you decided to keep messaging him, and even go as far to create a petition, which would have done what? Been used to spam him some more? If you didn't get a first reply you should have just stopped. Of course he's going to be frustrated at you, you're being a prick.
5) The japanese messages that you've sent are utter gibberish and are clearly just put through machine translation. I know you meant well but if your goal was to send him a message he might be able to understand, not only did you give him the opposite, but it looks incredibly lazy and is totally disrespectful. And then asking him if he was even Sanbon[do], as if he were a fake? Why did you think that was a good idea at all?
6) We do not represent your wishes and you shouldn't have told him this is an effort by "MotK" if you don't actually have a dedicated team of people on board. Would you actually be a part of such a translation group? Do you have the skills to work with hacking the game to make an english version, or a coding up a patch? By sending him these messages and saying you're from "us working at MotK" you're making everyone look bad. EDIT: Although by the sounds of it he's only really annoyed at you, so that's good at least.