You can import and export user data.
For information about importing and exporting using Crosswalk, see Using Crosswalk for Softimage [Data Management].
For information about importing and exporting using older versions of the dotXSI format, see Importing and Exporting dotXSI Files [Data Management]. The important thing to remember is to set the dotXSI File Version to 3.6 or later. User data is not supported in version 3.5 or earlier of the dotXSI format.