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.hh header files are not recognized even if configured in C/C++ Header File extensions. There is no code highlighting nor ability to switch between source and header in editor.
After adding hh to settings you need to restart IDE (to allow all *.hh files to be redetected) Without restarting only new or "not-yet-shown" *.hh files will be recognized as headers (btw, this is behavior in trunk, what is your version of IDE?)
Product Version: NetBeans IDE 6.1 (Build 200804211638) After restart extensions added before just disappears from list (strange). When I delete one of default, ie. "h", editor stops recognizing files immediately. Then, when I restore it, editor starts to recognize it again immediately.
Issue 134192 (Changes in list of C/C++ filename extensions disappear after restart) fixed in trunk. Fix will appear in patch2 (see http://wiki.netbeans.org/NetBeans61Patch2Plan).
all extension issues are fixed in trunk
please, disregard previous comment because next issue is not yet resolved: 135691 Extensions added in options aren't applied to existing files till NetBeans restart
marked this as duplicate of 135891 because this is only that left about this issue *** This issue has been marked as a duplicate of 135891 ***