Pro Tools 101_ An Introduction to Pro Tools 11 ( PDFDrive )

When audio is recorded into a Pro Tools session, each take of the audio
recording is stored as a separate file inside the corresponding session’s
Audio Files folder. Pro Tools natively supports audio files in either the WAV
or AIFF format. However, for cross-compatibility purposes, WAV is the
default file format for both Mac and Windows Pro Tools systems.
Note: Audio that you record in Pro Tools is saved only in the Audio Files
folder; it is not saved in the session file. When transferring sessions
between systems, be sure to copy over the entire top-level session
folder in order to include all associated audio files and other
material needed for the session.
MIDI Files
MIDI data is normally stored within the Pro Tools session; as such, no MIDI
files will exist outside the session document. However, MIDI files can be
exported from Pro Tools using the EXPORT > MIDI command. Exported
MIDI files can be recognized by their .mid extensions.
Sibelius Files
If you work with scores inside Pro Tools (WINDOW > SCORE EDITOR), you
can use either the SEND TO SIBELIUS command or the EXPORT > SIBELIUS
command to generate a score file that can be opened/edited with the fullfeatured
Sibelius notation software. Exported Sibelius files can be
recognized by their .sib extensions.
Bounced Files
The Bounced Files folder is the default directory that Pro Tools uses for files
created using the Bounce to Disk function. If you do not use Bounce to Disk,
this folder will remain empty and will be removed when you close the
session.
Clip Groups
The Clip Groups folder is the default directory that Pro Tools uses for any
clip groups you export from your Pro Tools session. If you do not export any
clip groups, this folder will remain empty and will be removed when you
close the session; clip groups used in your session are not stored in this
folder unless they’ve been exported.