Macro to Change mass Units via Options

Hi,

I'm looking for some assistance on setting the default units for mass and valoume in the options . I was thinking of a macro to change to m^3 and KG. any suggestions. (tried to record a macro but it doesnt seem to work when you use the mouse to navigate through the file menu bar; not sure what's the issue ??)

I'm new to macro's so it might be something sim[ple?

Thanks in Advance

SolidworksApi macros