.SD2F File Extension
File TypeSound Designer 2 File
What is an SD2F file?
Audio file created in the Sound Designer II format, a mono and stereo audio format developed by Digidesign (now Avid) for the company's audio editing products; contains audio data and the sample rate and bit depth information; often used as an interchange format between digital audio workstation (DAW) applications.
SD2F also use the .SD2 extension.