Sessions & Tracks : File and Session Management and Compatibility : Sharing Sessions Created on Different Pro Tools Software Versions

Sharing Sessions Created on Different Pro Tools Software Versions
For more information, see the following topics:
Pro Tools makes it easy to share sessions between different software versions of a particular Pro Tools system.
Pro Tools 10.x sessions cannot be opened with lower versions of Pro Tools. To save a Pro Tools 10.x session so it is compatible with a lower version of Pro Tools, use the File > Save Copy In command to select the appropriate session format.