To use the above file on Google Earth:
Right click and save somewhere on your computer.
Open Google Earth.
Navigate to where you saved the file
Select the file, click on Open
The route is the thin blue line along Lake Michigan. You can zoom in and see the part of the route you are interested in.
The Michigan USBR 35 file will be located under Temporary Places in the left box.
To save it so it will be available the next time you run Google Earth, highlight the filename, right click and Save to My Places.
There are a few changes that have been made to this route file that are different from the Google Maps versions as of this date.
This file anticipates that the route will be changed so that north of Holland, it follows Butternut Ave. rather than heading out to Holland State Park and following Lakeshore Drive.
Approaching Harbor Springs, the route leaves the bicycle trail at Beach Drive and enters Harbor Springs near the waterfront. This route needs to be checked for suitability.