Because I find the old icons set clearer and more visually efficient that the one currently provided with 3dsMax since release 2010, I wrote this little script to install it again properly.
Here is the visual difference between the two sets:
Installation and use:
Launch 3dsMax and drag and drop the .mzp file directly onto one of the viewports.
The installer window will open, then just follow the instructions.
Dialog box look: