On all my test systems (WinXP/WinVistaX64 / OL2007 / Python 2.4.4 / Pythonwin 210) clicking on the 'Browse' buttons in SpamBayes Manager on tab 'Notifications' gave an exception:
TypeError: Argument must be a 88-byte string
I couldn't find out the exact reason of the error because a shortage of documentation. So I wrote a reimplementation using GetOpenFileNameW() instead of GetOpenFileName().
I don't know if the previous code works on older versions of pythonwin32. So I left the old code unchanged and I think that this workaround maybe is the best solution for the problem.