All of the mtp-detect output is above (comment #10)
From my talk with support:
===
->[r],612/U<----[USA PD Technical Support]--[Re: playlists on the PD-6140]------

Date: Wed, 10 Dec 2008 08:42:15 -0700
From: USA PD Technical Support <email address hidden>
To: <email address hidden>
Subject: Re: playlists on the PD-6140
X-Mailer: Microsoft Outlook Express 6.00.2900.5512

Dear Customer,

The PD-6140 supports .pla playlists which can be easily be created and synced to the PD-6140 with a program like Windows Media Player 10 or 11.

For instructions on how to create a playlist with Windows Media Player, please refer to the help guide within Windows Media Player or check these links from Microsoft. 

Windows Media Player 11: http://www.microsoft.com/windows/windowsmedia/knowledgecenter/howto/mp11/playlists.aspx#CreateandEditYourPlaylists

Windows Media Player 10: http://www.microsoft.com/windowsxp/using/windowsmediaplayer/getstarted/makeplaylist.mspx

Best Regards,

US Technical Support
http://www.perceptiondigital.com/

----- Original Message ----- 

From: "Joseph Pingenot" <email address hidden>
To: <email address hidden>
Sent: Tuesday, December 09, 2008 10:17 PM
Subject: playlists on the PD-6140


> Hello.
> 
> I'm trying to get a playlist of MP3s onto the PD-6140, and am having
>  trouble getting the playlits recognized.  What playlist formats does
>  the PD-6140 accept, how do the filenames need to be formatted, and
>  where should they reside?  For example, can the playlists be .m3u
>  files with paths including the long file names and drive letters, and
>  should they be in the Playlists folder?
> 
> Thank you very much!
> 
> Sincerely,
> Joseph
===
->[r],613/T<----[USA PD Technical Support]--[Re: playlists on the PD-6140]------

Date: Wed, 17 Dec 2008 07:34:26 -0700
From: USA PD Technical Support <email address hidden>
To: <email address hidden>
Cc: <email address hidden>
Subject: Re: playlists on the PD-6140
X-Mailer: Microsoft Outlook Express 6.00.2900.5512

Dear Customer,

For the Playlist on PD6140, there is only a way to generate .pla file through Windows Media Player. 

WMP will create a playlist which will sync to PD6140, and it will also create some entries in PD6140's database. For PD6140 point of view, it will just read up the database to list out and playback the database entries. 
For the .m3u playlist, we have platform limitation to read a .m3u playlist. it also require WMP to perform some conversions of .m3u file to .pla file while it is sync to the device.

So, for PD6140, it cannot support any playlists that are created by any software except WMP. That means it cannot add a playlist under Linux/XOS.
Best Regards,
US Technical Support
http://www.perceptiondigital.com/


----- Original Message ----- 
From: "Joseph Pingenot" <email address hidden>
To: "USA PD Technical Support" <email address hidden>
Sent: Monday, December 15, 2008 4:47 PM
Subject: Re: playlists on the PD-6140


> Any word on how to create a .pla playlist file that the player will
>  recognize?  I'm trying but failing.
> Hoping to get your help increasing your marketshare,
> Joseph
> 
> From USA PD Technical Support on Wednesday, 10 December, 2008:
>>Dear Customer,
>>
>>The PD-6140 supports .pla playlists which can be easily be created and synced to the PD-6140 with a program like Windows Media Player 10 or 11.
>>
>>For instructions on how to create a playlist with Windows Media Player, please refer to the help guide within Windows Media Player or check these links from Microsoft. 
>>
>>Windows Media Player 11: http://www.microsoft.com/windows/windowsmedia/knowledgecenter/howto/mp11/playlists.aspx#CreateandEditYourPlaylists
>>
>>Windows Media Player 10: http://www.microsoft.com/windowsxp/using/windowsmediaplayer/getstarted/makeplaylist.mspx
>>
>>Best Regards,
>>
>>US Technical Support
>>http://www.perceptiondigital.com/
>>
>>----- Original Message ----- 
>>
>>From: "Joseph Pingenot" <email address hidden>
>>To: <email address hidden>
>>Sent: Tuesday, December 09, 2008 10:17 PM
>>Subject: playlists on the PD-6140
>>
>>
>>
>>> Hello.
>>> 
>>> I'm trying to get a playlist of MP3s onto the PD-6140, and am having
>>>  trouble getting the playlits recognized.  What playlist formats does
>>>  the PD-6140 accept, how do the filenames need to be formatted, and
>>>  where should they reside?  For example, can the playlists be .m3u
>>>  files with paths including the long file names and drive letters, and
>>>  should they be in the Playlists folder?
>>> 
>>> Thank you very much!
>>> 
>>> Sincerely,
>>> Joseph
===