After checking the bug '1248 Key bindings not modified' , it was Identified que the creation of the hashmap list 'defKeyBinds' that sets the standard keyboard shortcuts , the feature 'Open folder' was not included in the 'defineDefaultKeyBindings ( )' method in 'JabRefPreferences' class .

Author: alauber

src/main/java/net/sf/jabref/JabRefPreferences.java

@@ -885,11 +885,10 @@ public KeyStroke getKey(String bindName) {
             // So, if this happens, we add the default value to the current
             // hashmap, so this doesn't happen again, and so this binding
             // will appear in the KeyBindingsDialog.
+            Globals.logger("Could not get key binding for \"" + bindName + "\"");            
+            s = "Not associated";
             keyBinds.put(bindName, s);
         }
-        if (s == null) {
-            Globals.logger("Could not get key binding for \"" + bindName + "\"");
-        }
 
         if (Globals.ON_MAC) {
             return getKeyForMac(KeyStroke.getKeyStroke(s));