Assigns a Material Modifier to the bottom level of the Modifier Stack with an option to collapse to the modifier once
Usefule for quickly changing the MatID for an entire mesh while preserving the modifier stack.
To install just drag the download .MZP file into the 3dsmax interface. You should get an Install dialog.
This tool will install a macroscript that can be accessed from the Customize User Interface dialog within 3dsmax.