When running the xp_restore_filelistonly using version6.1, thee additional columns appear.
FileId
BackupSizeInBytes
FileGroupId
This command is similar to the 'RESTORE FILELISTONLY' command in SQL Server. There was a request to have this information added when running the xp_restore_filelistonly store procedure
Our datatypes are NVarChar but hold the same values as the natively defined datatypes.
Example from native doc: