Since the names of root (registered) soundfiles must have a standard form <rootname00.wav> where <rootname> is any name, you are asked to accept the name suggested by the Soundfile Manager or specify a new name.
The Soundfile Manager supervises all restoration experiments, which involve root soundfiles as well as files derived from root files called derivative soundfiles. The names of derivative soundfiles are automatically generated and have the form <rootname[xy].wav>, where [xy] is a non-zero two-digit serial number assigned by the system.