well it's very simple, the topic says all 'cause when i saw the fill library in ac10, there are some missing fills that were in ac9 (why?) so i want to know if there's a safe way to import those fills.
Use Attribute Manager in AC10. Open the AC9 file in the right pane and Append the attributes you need to the current AC10 project. I would strongly suggest not using the Overwrite button.