Upgrade legacy materials from older files to the new format.
When a material created in a legacy AutoCAD-based product (2010 or earlier), is shown in the Materials Editor, you have the option to convert the material into an editable format. After the conversion, the Materials Editor controls are enabled and editable.
Legacy materials are rendered but not editable in the application. It is recommended to convert these materials to their Generic equivalent. The new materials provide better results and can be shared across Autodesk applications.