You can access all basic sampler instrument file operations using the commands in the Instrument Editor Instrument menu.
Save: Saves the currently loaded sampler instrument. When you create a new instrument and save it for the first time, you are asked to provide a name. If you have edited an existing sampler instrument and use this command, the existing filename is used and the original instrument is overwritten. You can also use the Save Instrument key command.
Save As: Saves the currently loaded sampler instrument, but you are prompted to provide a different filename. Use this command when you want to save a copy or multiple versions of an edited sampler instrument, rather than overwriting the original version.
Rename: Renames the loaded sampler instrument. The renamed version replaces the original version on the hard disk.
Export Sampler Instrument and Sample Files: Copies the selected sampler instrument, including all associated audio files, to another folder location. Choosing this command opens a dialog where you can browse to an existing folder or create a new folder. You can also use the Export Sampler Instrument and Sample Files key command (default: Control-C).