Is it possible to list the airplanes in your computer by livery?

No.

Is it possible to list the airplanes in your computer by livery?

Sure you can. I have my by manufacturer, but that is not in FSX Airplane folder. :( The answer as briefly said by gbogeaus is still No, but ... I have an idea! If you are wanting to show the planes in the game's aircraft menu by livery it might be possible, though not very easily. All you would have to do is change registered values listed in the drop down menus and you might be able to alter FSX to show plane by livery, by changing the manufacturer name to the livery name. :( Now that I'm thinking about it I may...may try, but don't wait on me. :(