A not-working Build button can have 3 reasons: 1) using a beta version, 2) an incomplete Gamestudio installation (the file "wwmp2wmb.exe" is damaged or missing), or 3) a Windows problem with MFC.

1) is solved by legally purchasing Gamestudio, 2) by re-installing the latest update, 3) requires a Windows XP re-installation. If you have an older version than XP, you might also need to install the Acessibility update from the download page or your Gamestudio CD.