the location of .desktop file about right-click menu ?

[qiang zhang]

I found there are only a little .desktop file in the directory
I/usr/share/apps/konqueror/servicemenus/ .I want to know where is the
.desktop file about the right-click menu in kde4.For example when i right
click the panel ,there are many menu item : Add Widgets, Add Panel ...Where
those  menu items are stored.Thanks very much.
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