I'm sure this is a frustrating for you as it is for me. I can't find the file.
That's because, instead of just typing %APPDATA%\Virtuali\GSX in an Explorer window (and press Enter), you typed it in the "Search" box, which would never work. In order for that command to work, it MUST be typed in the normal address bar of the Windows File Explorer, NOT the "Search".
Or, you can just press the "Window" key, and start typing %APPDATA%\Virtuali\GSX there. You'll see the folder names will start to be composed and, after you finish typing the last letter, press Enter, will open the right folder.
Or, you can right-click on the "Windows" icon on the lower left side of the screen, select "Run" and type %APPDATA%\VIRTUALI\GSX and press Enter.
A video tutorial here: