I believe I have decyphered the meaning of the .txt part. Other than that, no luck.
I've also tried contacting blockladder on the email address blockladder@yahoo.co.jp, but unfortunately, it's been long disabled. You can send messages to watashi, but don't expect an answer. Though, I believe they are still watching.

I haven't given up yet.

P.S: I'd like to see thinking-out-of-the-box people as Tsuyugushi appear again. It is not over.

P.S.2: I'm getting some serious progress now. Or it's one huge coincidence.

P.S.3: Assuming all I know is true, and hell, this would be a magical coincidence if not, I have also decyphered the whole meaning of the question. What remains a mystery is the logic behind the anagram and a correct combination.