No 'Vehicle' folder visible on Montana 700

I'm trying to install a custom vehicle icon as per these instructions:

'Connect your Montana to your computer using the usb cable and use your finder (mac) or file explorer (win) to open the Montana as you would a regular USB drive. Open Garmin > Vehicles. Place the .srf file in that folder. Disconnect and turn your Montana on and for each profile, choose what vehicle you want under Map > Setup > Advanced Setup > Vehicle.'

Whe I open the 'Garmin' folder, there is no 'Vehicle' folder present. Nor can I find it using the search function (using Windows).