.SDII File Extension
Sound Designer 2 Audio File
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What is an SDII file?
Audio file formatted with the Sound Designer II standard, a mono and stereo audio format developed by Digidesign (now Avid); stores sample rate and bit depth data in addition to the audio data itself; commonly used for transferring audio data between digital audio workstation (DAW) applications.
SDII is rarely used for Sound Designer II audio files. Use the .SD2 extension instead.
Programs that open or reference SDII files
Included with OS