This link:
Suggests I should be able to add syntax highlighting for .for files in Visual Studio 2017. I have added the Fortran TextMate Grammar to my user profile as the article suggests, but I can't get any highlighting to work.
Is there some missing step? Do I need to do something in VS2017?
I found the problem, and it's a little dumb, but so others don't fall into the same trap... I had .for files open in my solution and kept just re-opening it to see if the highlighting was working. This would automatically reopen the files that were last open in the solution, but wouldn't highlight them...until I closed and reopened the .for files.
D'oh!