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During installation of the runtime inspector aka beanbrowser in the 6.5 development Netbeans IDE Dev 081226 using the update center version dated 2008-12-23, the plugin manager says: Some plugins require capability org.openide.modules.os.Windows No plugin providing the capability org.openide.modules.os.Windows could be found.
Working fine for me with a dev build on Linux. This module is platform-independent. Perhaps you were also trying to install some other module that only runs on Windows.