Macro to change custom properties of sldlfp.

I would like to change the custom properties for all of the sldlfp files that I have.

For example, for all of the square tubes have TS and then the sizes, "TS2.5x2.5x0.25"  I would like the macro to replace the "TS" with "SQUARE TUBE" and laeve the sizing alone.

I have never written a macro so I don't know where to start.

SolidworksApi macros