SoundCap audio file
File type: Audio and sound file
The FSSD file extension identifies an audio file in the SoundCap format.
FSSD files were used with SoundCap on Classic Mac OS computers.
File type category:
Audio and sound file
Date updated: September 27, 2026
The SoundCap audio format was popular on Classic Mac OS computers. It is also known as a MacNifty, SoundMaster or SoundWave file, names associated with the hardware and software used with the format.
The format stores audio for use with SoundCap on compatible Macintosh systems.
A variant of the format uses the HCOM file extension instead of FSSD.
Open an FSSD file with SoundCap on a Classic Mac OS computer.
Use SoundCap on Classic Mac OS to open the file. If the program provides an export option, save the audio in a format supported by modern audio software.
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