Editing Origin version

[Cardiff]

Is there a way to add new minifaces and/or import new face textures in this version? I can't find any RX3 files inside the Origin version.

Would really appreciate help.

 

[bassio]

Origin version has the same structure as the DVD version (I already own the Origin version).
Minifaces aren't in RX3 format, they are in dds format.
Minifaces are located in the following files:
Game\data\ui\imgAssets\heads\2dheadsX.big where X is (0 -> 3)