While Mupen64 has not had a release since 2005, development on Mupen64Plus is active with releases every few months and support provided for all included plugins. Open up the solution file: mupen64plus-ui-console\projects\msvc8\mupen64plus-ui-console.
Bugfix: GTK GUI: 'Toolbar Style' now works - Bugfix: Many other minor bug fixes, GTK warnings fixes, translation corrections, etc Mupen64Plus has a new Home Page over at Google Code, with lots of useful information, screenshots, a bug tracker, a discussion forum, etc.