Go to "Edit" then open the mats library, then click "Import" button on the bottom of the menu, once you open, find the folder, "Materials", then "User"(Make sure it is "User" folder, it wont work if it's the "Installed" folder) and then find the Mat file and open, then it should automatically load into your library with a small thumbnail preview!!!:-) (Same Goes for Sky's and Object Files that are .obp, in their individual respective folders as "User") Hope this Helps Art