Open File

Tools → Curve Manager → File → Open            Shared Dialog Box
Opens a property file in the Curve Manager. Once you've opened the file, you can modify it as needed.
 
For the option:
Do the following:
Type
Specify the type of property file you want to open in the Curve Manager. The property file types are:
■Spring
■Damper
File
Specify the property file you want to open.