Hi everyone~  I have a question!

A long while ago I downloaded a batch torrent of Arashi discography.  With it came a "special version" of Check no Muffler (チェックのマフラー) -- basically an acoustic-y piano-y live version of it.  (Here it is on Mediafire if you want to sample)

It's a really beautiful version (and I like it better than the original in fact), but my problem lies in two things!

1!  I can't figure out where this came from, whether it be a TV show or radio program or what!
2!  MY FILE CUTS OFF LIKE HALFWAY THROUGH!!!!!!!  HNNNNNNNG!!!

obviously the latter is a much more dire problem, because I LOVE THIS SONG and it saddens me greatly to not have the whole thing.  So I came here in hopes that someone knows more about it and more importantly has the full version!

thanks in advance.  I hope someone can help me ;_;