AAC is the audio layer from the follow-on format to MP3 (see .M4A extension). The .M4P extension is AAC purchased from Apple's Music Store (iTune) and is protected by a Digital Rights Management scheme. George. From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx] On Behalf Of Kevin Gibbs Sent: 05 February 2009 16:32 To: ddots-l@xxxxxxxxxxxxx Subject: [ddots-l] Re: m4p files What are they? Where did you encounter them? -----Original Message----- From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx] On Behalf Of HF Sent: Thursday, February 05, 2009 10:07 AM To: ddots-l@xxxxxxxxxxxxx Subject: [ddots-l] Re: m4p files No, m4p. HF ----- Original Message ----- From: Kevin Gibbs <mailto:kevjazz@xxxxxxxxx> To: ddots-l@xxxxxxxxxxxxx Sent: Thursday, February 05, 2009 11:03 AM Subject: [ddots-l] Re: m4p files Do you mean mp4? -----Original Message----- From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx] On Behalf Of HF Sent: Thursday, February 05, 2009 8:54 AM To: ddots-l@xxxxxxxxxxxxx Subject: [ddots-l] m4p files Anyone know where to play these files? Or at least converting them into MP3. Winamp doesn't play them and Sonar doesn't recognize them either. HF