Supported Audio File Formats
WAV or BWF (.WAV) (including support for WAV Extensible and RF64) audio files that are the same sample rate as the project can be imported into a Pro Tools | First project without conversion.
Audio files of the following types can be imported into Pro Tools projects, but are converted to 32-bit Float WAV on import:
• AAC audio (including audio with AAC, Mp4, and M4a file extensions)
• ACID files
• AIFF
• MP3
• QuickTime (Mac only)
• ReCycle (REX 1 and 2) files
• Sound Resource (AIFL—Mac only)

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.