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C++-only version downloaded from this website: http://download.netbeans.org/netbeans/6.1/final/ . Running Debian lenny on x86. Tools -> options -> C++ -> other -> C++ File extensions [Edit] option fails to set anything: if I add new extension, it is not even used in current session. When I quit IDE and restart it, all my settings changes are canceled (defaults are restored). Manually editing ~/.netbeans/6.1/config/Preferences/org/netbeans/modules/cnd.properties doesn't make things better: modifications are referted just after starting NetBeans IDE. (def-ext-org.netbeans.modules.cnd.loaders.CCDataObject, ext-list-org.netbeans.modules.cnd.loaders.CCDataObject).
This bug is candidate to fix in patch. *** This issue has been marked as a duplicate of 134192 ***