I beg to differ...
The Stihl file guide should rest on cutter and depth gauge, that provides support along the entire stroke...even the bar and chain manual shows it resting on both.
A tip...usually you hold the file/guide level across the chain...if you need to put more hook in the cutter lift your right hand and file downwards, if you have too much hook, do the opposite...just a couple of strokes is usually enough.