About This File
Original readme file by Vernon:
Installation
Note only tested on max9 but “should” work apparently on the earlier versions
Before you run max
Copy the script to your “3dSmax\scripts” directory
Run max
Go Menu > Maxscript > Run Script
Navigate (if you need to) to the “3dSmax\scripts” Directory and select minmaxextents.mcr
Nothing will happen 
Go menu > Customize > Customize user interface
Under either the Keyboard OR the Toolbar Tab…
Select Utilities from the Category Dropdown
Assign the (hopefully visible) “Min Max Extents” script to either a keyboard shortcut or drag the icon up on to a toolbar
Phew…
Use
With a model open, run the script and it will prompt you for a text file name to save the output to
Once its finished it “should” open notepad for you to copy/paste the output into your data.ini
Otherwise just open the saved file in any text editor for the same result
