If the animation has not been saved before, the Save As dialog is displayed allowing you to choose a name for the OAF file.
The OAF File Format of a file is preserved. This means that if a type 1 OAF file was loaded with the Open command, it will be saved also as a type 1 disregarding the default OAF save format. The format for an OAF file can be changed through the Properties dialog.