Shape property control, via an external file

Hello Kirupians,
Here’s my first post ever… Kirupa noob ftl.
I would like to know if it is possible to control a shape object’s (Graphic symbol content) properties via an external file. The final idea is that each of the graphic symbols on my stage could have there color value changed by anybody without having to open - modify, and recompile the project.

So far, googling etc, I have found a few people being able to change movieclip background colors via .txt files (so this is a possible work around/alternative), but nothing so far as direct shape property control. I appreciate that the shape object in itself is not able to be assigned an instance name which leads me to believe that what I would like, is more than likely not possible.

Either way though, please impress on me the fountain of flash knowledge that I am lacking, and any other suitable solution ideas would be awsome.

P.s I am prepared for a roasting if I have not adhered to nooby question rules…