for files support&paths look at your garmindevice.xml in Garmin folder.
For example:
or look hereQuote:
<Name>PreProgrammed3DMaps</Name>
-<File>-<Specification><Identifier>IMG</Identifier></Specification>
-<Location> <Path>.System</Path><BaseName>gmap3d</BaseName>
<FileExtension>img</FileExtension>
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