See this discussion on gmane: http://comments.gmane.org/gmane.comp.terminal-emulators.tmux.user/5498
Original patch to putty-X: atsepkov/putty-X@bbcedf5
Apply hack by 'unphased' to fix mouse wheel up events for vim (and ot…
I compiled with this patch and using. Thanks a lot. It was really annoying without scroll up.
Compiled in windows 8.1 with MVC 2012.
Tested on windows 8.1 and 7