GarminMapUpdater_v2.5.14.exe" stores the GMAP files and MapSource installation in "%TEMP%\IMG". Additional files like "*.JCV", "*.SRX", "*.ASR", "gmap3d.img" & "gmaptz.img" are stored in "%TEMP%". The files you receive depends on the "PartNumber" tag in the "GarminDevice.xml" file. Changing to a a PartNumber as for example to a nüvi 3790T with "<PartNumber>006-B1101-00</PartNumber><SoftwareVersion>250</SoftwareVersion>" will make the GarminMapDownloader to pick the additional files even for a non compatible Garmin device. nüvi 3790 download gets a larger photo-realistic JCV file that's probably not useful in other JCV capable units.
Example for CNEUNT 2011.30:
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