MS doesn't let you 'see any Img map file' in the way that i think you mean. It will display the map tiles from the gmap folder and allow you to select from 1 right through to all of its individual tiles (separate parts) to be compiled together into a gmapsupp.img image file to be sent to your unit. You can even combine parts of 2 or more maps this way too. You can learn how to use MapSource from this video:
If the gmap folder is correctly installed it will show in MS. Ensure the required map is selected in the drop-down box in the upper left. The map will display in the right side panel, and the names and sizes of any selected tiles will be shown in the left panel.
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