To have full cross platform capabilities of Pro Tools sessions from PC to Mac:1) When creating new Pro Tools sessions, select "Enforce Mac/PC Compatibility.2) If the Pro Tools session has already been created: File Menu > Save Session Copy In > Select "Enforce Mac/PC Compatibility. Copy audio files.3) Burn the Pro Tools session folder on a data CD from the PC. 4) Install the Joliet File System Extension for Mac OS into the Extensions Folder on the Mac hard drive and restart. This extension will allow the Mac to correctly view a Windows CD. The Joliet extension can be downloaded from the Digidesign website: digidesign.com > Support > Downloads > Utilities & Links to Third Party Software > Download Joliet File System Extension for Mac OS.5) Copy the Pro Tools session from the CD to the Mac hard drive. 6) The Mac must have the Joliet File System Extension for Mac OS installed on the Mac before the Pro Tools session can be copied to the Mac. If Joliet is installed on the Mac after copying the Windows Pro Tools session from a CD, Pro Tools will not recognize the audio files. The Joliet extension does not work retroactively. It must be installed on the Mac first in order to view the Windows CD correctly. If Joliet is installed after copying the Windows Pro Tools session to the Mac hard drive, trash the session and re-copy the session. Now Pro Tools will correctly recognize the Windows originated Pro Tools session.