Sessions & Tracks : Importing and Exporting Session Data : Audio Conversion on Import : Supported Audio File Formats

Supported Audio File Formats
Audio files of the following types can be imported into Pro Tools sessions without conversion:
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Audio files of the following types can be imported into Pro Tools sessions, but will be converted to the current session file format on import:
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AAC audio (including audio with AAC, Mp4, and M4a file extensions)
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SD II
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SD I
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Pro Tools cannot import protected AAC or MP4 files with the .M4p file extension. These files are protected under the rules of digital rights management.