I've got some reports recently that Delta Force would not work with Tactical Magnifier. Luckily, this is not anything like Delta Force blocking tactical magnifier, it's more like Delta Force prevented Tactical Magnifier to read user inputs. I have found a fix for it. I am not sure yet if other games could do the same thing, but it's highly probable. Give it a try if Tactical Magnifier does not work with your game ! The fix is to start the app with admin permission. Here is how to do that : 1. When you start the app, you should see a third option that says "Launch as admin", this is it. 2. If you don't see any launch options, right click Tactical Magnifier in your steam library then : ->Properties ->General ->Select Launch Options -> Select either "Launch as Admin" or "Ask when starting Game" If after this is still does not work, then please let me know which game so I can test it by myself