wine users - May 2008 - starting programs via context menu

I'm running Sidux and Wine 1.0-RC2. When I right clicked on an exe file it
showed me an option to launch the file using wine. That feature is now gone and
even double-clicking does not work but instead offering me to choose a program
for opening the file.

Now I want to re-enable the context menu feature or at least let wine open exes
by double clicking.

thanks