I installed Dory using Garmin's installer. Only a single file called Dora800x480.dshb was installed in the dashboard folder. This dshb file is some type of GIR file which is an assembley of the Dora files you posted. At runtime, I guess the GPS is reading this file like any other GIR file. Still, I do not see the code you are referring to unless you are thinking about the GIR header file.