No. MS v 6.16.3 is working on .img files on my win7 computer. I copy the gmap folder (City Navigator North America NT 2013.40.gmap) into the C:/programData/Garmin/Maps folder, and this installs the map in the Mapsource V 6.16.3. To view this map in MS v 6.13.7 I reverse convert the gmap to Drive E:/Garmin, and delete the gmap folder in C:/ProgramData/Garmin/Maps. The .img files in E:/Garmin will work with both Mapsources. To Uninstall the map from Mapsource I use the MapSetToolKit V 1.77, and delete map folder in C: Drive.