Visual studio 2017 cshtml syntax highlighting not working

The repair tip actually worked. I was not aware that you could repair your instance... Thank you for the help!

To repair, go to "Programs and Features", select "Microsoft Visual Studion 2017" and choose "Change". The Repair option is shown here:

Select all (Ctrl+A) and Copy(Ctrl+C) everything in the .cshtml file. Delete everything! Save (Ctrl+S) the empty file. Then paste (Ctrl+P). Worked for me!