-
Editing a text file below C:\Program Files does not require running Opus elevated as administrator. You only need the text editor to be elevated. You can launch an elevated text editor from Opus without Opus itself being elevated.
-
Non-admin processes cannot ask an admin process to do something. The request is blocked.
This is one of several reasons it's usually not a good idea to run dopus.exe itself elevated.
Instead, launch Opus normally, then use Opus's UAC Support and Administrator Mode to set individual windows to run their commands elevated (with an optional timeout before they revert to normal), if you need to run several things elevated.