However if I can understand where to find fsx.cfg in the correct format (so I can insert the %appdata%\Microsoft\FSX ..) I have no problem in making the wide aspect change to cfg.
Hi macca. I think you're getting confused. People have their own ways of doing things & this is one way of finding fsx.cfg from the Windows Start/Run command. Click OK to open the folder where fsx.cfg is located.

If you already found fsx.cfg open it in Notepad & change the WideViewAspect= value from False to True
Make sure you're editing the correct file - fsx.cfg & not fsx.cfg.txt which is a backup.