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dev #20011015 check Options, IDE Configuration, System, Object Types, Action Instances and remove i.e. the 'settings' extension from the list -> the ide will be totally unusable - no fss, cannot exit, etc. - no settings avaible ;-) So make the extensions list property read only for action instances and folders, generally for all system loaders.
The bug was fixed in two places: 1) InstanceDataObject - it is not possible to remove 'instance', 'ser' and 'settings' extensions from the extension list property. 2) The 'extensions' property in beaninfos for InstanceLoader and FolderLoader is now read-only.
verified in dev#20011019
I implemented the better solution proposed by Jesse Glick. PropertyDescriptor array from UniFileLoaderBeanInfo is not used and modified any more. The change is in org.netbeans.beaninfo.DataLoaderPool .
Resolved for 3.4.x or earlier, no new info since then -> closing.