They're stored in ~/Library/Preferences/.GlobalPreferences.plist
in the following format:
NSUserKeyEquivalents = { "System Preferences…" = "@~,"; };
Methodology: ran sudo opensnoop | grep '.plist'
in order to see plist
files being accessed while modifying the settings in System Preferences. (Note: on El Capitan, SIP prevents running opensnoop
by default. It can be enabled by enabling dtrace
.)