This is not a Microsoft MTP descriptor...
Device response to read device property 0xee:
	fffffff0: 00ff ff00 001f 1e1d 1c1b 1a19 1817 1615	................
	0000: 1413 1211 100f 0e0d 0c0b 0a09 0807 0605	................
	0010: 0403 0201 9ece ffff ffff ffff ffff ffff	................
	0020: ffff ffff ffff ffff ffff ffff ffff ffff	................
	0030: ffff ffff ffff ffff ffff ffff ffff ffff	................
	0040: ffff ffff ffff ffff ffff ffff ffff ffff	................
	0050: ff90 0201 010b 0322 0601 0f0f 0005 0f00	......."........
	0060: b40e 0310 0f00 081f 0001 1f00 370f 0022	............7.."
	0070: 0f0c 0c0f 0236 0fde ee00 04b0 0002 0001	.....6..........
	0080: 5502 d000 04b0 0258 c348 0000 0000 0000	U......X.H......
	0090: 00                                     	.
Autodetected device "SanDisk Sansa e200" (VID=0781,PID=7420) is known.
Connected to MTP device.
USB low-level info:
   Using kernel interface "usbfs"
   bcdUSB: 512
   bDeviceClass: 0
   bDeviceSubClass: 0
   bDeviceProtocol: 0
   idVendor: 0781
   idProduct: 7420
   IN endpoint maxpacket: 512 bytes
   OUT endpoint maxpacket: 512 bytes
   Device flags: 0x00000000
Device info:
   Manufacturer: SanDisk
   Model: Sansa e280
   Device version: PP5022AF-05.51-S301-02.18-S301.02.18A-D, (Build 32.10)
   Serial number: 00000000-00000000-3978b387-d9fdf912-00000000
   Vendor extension ID: 0x00000006
   Vendor extension description: microsoft.com/WMDRMPD: 10.1; portalplayer.com: 1.0; 
Supported operations:
   1014: Get device property description
   1015: Get device property value
   1016: Set device property value
   1017: Reset device property value
   1001: get device info
   1002: Open session
   1003: Close session
   1004: Get storage IDs
   1005: Get storage info
   1006: Get number of objects
   1007: Get object handles
   1008: Get object info
   1009: Get object
   101b: Get partial object
   100c: Send object info
   100d: Send object
   100b: Delete object
   1012: Set object protection
   100f: Format storage
   9801: Get object properties supported
   9802: Get object property description
   9803: Get object property value
   9804: Set object property value
   9805: Get object property list
   9806: Set object property list
   9810: Get object references
   9811: Set object references
   9201: Report Added/Deleted Items
   9101: Get secure time challenge
   9102: Get secure time response
   9103: Set license response
   9104: Get sync list
   9105: Send meter challenge query
   9106: Get meter challenge
   9107: Get meter response
   9108: Clean data store
   9109: Get license state
   910a: Send WMDRM-PD Command
   910b: Send WMDRM-PD Request
Events supported:
   None.
Device Properties Supported:
   0x5001: Battery Level
   0xd101: Secure Time
   0xd102: Device Certificate
   0xd401: Synchronization Partner
   0xd402: Device Friendly Name
Playable File (Object) Types and Object Properties Supported:
   3001: Association/Directory
      dc01: StorageID
      dc0b: ParentObject
      dc07: ObjectFileName
      dc04: ObjectSize
      dc02: ObjectFormat
      dc41: PersistantUniqueObjectIdentifier
      dc4f: NonConsumable
      dc44: Name
      dc03: ProtectionStatus
      dc09: DateModified
   3009: MP3
      dc01: StorageID
      dc0b: ParentObject
      dc07: ObjectFileName
      dc04: ObjectSize
      dc02: ObjectFormat
      dc41: PersistantUniqueObjectIdentifier
      dc4f: NonConsumable
      dc03: ProtectionStatus
      dc09: DateModified
      dc8b: Track
      dc99: OriginalReleaseDate
      dc0a: Keywords
      dc44: Name
      dc46: Artist
      dc8c: Genre
      dc9a: AlbumName
      dc89: Duration
      de9a: AudioBitRate
      de93: SampleRate
      de94: NumberOfChannels
      dc8a: Rating
      dc91: UseCount
      d901: BuyFlag
   3008: MS Wave
      dc01: StorageID
      dc0b: ParentObject
      dc07: ObjectFileName
      dc04: ObjectSize
      dc02: ObjectFormat
      dc41: PersistantUniqueObjectIdentifier
      dc4f: NonConsumable
      dc03: ProtectionStatus
      dc09: DateModified
      dc8b: Track
      dc99: OriginalReleaseDate
      dc0a: Keywords
      dc44: Name
      dc46: Artist
      dc8c: Genre
      dc9a: AlbumName
      dc89: Duration
      de9a: AudioBitRate
      de93: SampleRate
      de94: NumberOfChannels
      dc8a: Rating
      dc91: UseCount
      d901: BuyFlag
   ba05: Abstract Audio Video Playlist
      dc01: StorageID
      dc0b: ParentObject
      dc07: ObjectFileName
      dc04: ObjectSize
      dc02: ObjectFormat
      dc41: PersistantUniqueObjectIdentifier
      dc4f: NonConsumable
      dc44: Name
      dc03: ProtectionStatus
      dc09: DateModified
   ba03: Abstract Audio Album
      dc01: StorageID
      dc0b: ParentObject
      dc07: ObjectFileName
      dc04: ObjectSize
      dc02: ObjectFormat
      dc41: PersistantUniqueObjectIdentifier
      dc4f: NonConsumable
      dc03: ProtectionStatus
      dc09: DateModified
      dc0a: Keywords
      dc44: Name
      dc46: Artist
      dc8c: Genre
      dc81: RepresentativeSampleFormat
      dc86: RepresentativeSampleData
      dc83: RepresentativeSampleHeight
      dc84: RepresentativeSampleWidth
   b901: WMA
      dc01: StorageID
      dc0b: ParentObject
      dc07: ObjectFileName
      dc04: ObjectSize
      dc02: ObjectFormat
      dc41: PersistantUniqueObjectIdentifier
      dc4f: NonConsumable
      dc03: ProtectionStatus
      dc09: DateModified
      dc8b: Track
      dc99: OriginalReleaseDate
      dc0a: Keywords
      dc44: Name
      dc46: Artist
      dc8c: Genre
      dc9a: AlbumName
      dc89: Duration
      de9a: AudioBitRate
      de93: SampleRate
      de94: NumberOfChannels
      de99: AudioWAVECodec
      dc8a: Rating
      dc91: UseCount
      d901: BuyFlag
Storage Devices:
   StorageID: 0x00010001
      StorageType: 0x0003
      FilesystemType: 0x0002
      AccessCapability: 0x0000
      MaxCapacity: 7998969924
      FreeSpaceInBytes: 7332210756
      FreeSpaceInObjects: 4852
      StorageDescription: PPI NAND
      VolumeIdentifier: VOL0_Sansa_e280_00000000-00000000-3978b387-d9fdf912-00000000
Special directories:
   Default music folder: 0x00000000
   Default playlist folder: 0x00000000
   Default picture folder: 0x00000000
   Default video folder: 0x00000000
   Default organizer folder: 0x00000000
   Default zencast folder: 0x00000000
   Default album folder: 0x00000000
   Default text folder: 0x00000000
MTP-specific device properties:
   Friendly name: sansa e280
   Synchronization partner: (NULL)
   Battery level 100 of 100 (100%)
libmtp supported (playable) filetypes:
   ISO MPEG-1 Audio Layer 3
   RIFF WAVE file
   Microsoft Windows Media Audio

Secure Time:
<DRMCLOCK type="status"><VALUE>#20070612 20:33:57Z#</VALUE><FLAG>DRM_CLK_SET</FLAG></DRMCLOCK>

Device Certificate:
<DEVCERT version="1.0"><CERTIFICATE type="DEVICE"><DATA><UNIQUEID private="1">AAAAAAAAAACHs3g5Evn92QAAAAA=</UNIQUEID><PUBLICKEY private="1">XBfYUExu4RJLuwN77zcT2xTkvh7T7N0magJQRAYkpknJSDnq1Or2UQ==</PUBLICKEY><KEYDATA>OgqWjYuBrpsm8wc2n4glUWNh/JA=</KEYDATA></DATA><MSDRM_SIGNATURE_VALUE>7rvLVlnF84HOsB5zCfI8AhtflCjrHZ+4BEw6kPCVnFMKuXdAbLI1Qg==</MSDRM_SIGNATURE_VALUE><SYMSIGNATURE>mQM969YcrKLwCguMNsbDagLb66k=</SYMSIGNATURE></CERTIFICATE><FALLBACK><SECURITYVERSION>2.4.104.93</SECURITYVERSION><CERTIFICATE private="1">XBfYUExu4RJLuwN77zcT2xTkvh7T7N0magJQRAYkpknJSDnq1Or2UQIEaF15le90TVR36HoyIGeh6ETPgoy7DLyBMQ6KzvSi40OekNHTfq2eH/kJ</CERTIFICATE></FALLBACK><CERTIFICATE type="GROUP"><DATA><NAME>Sansa e200 Series</NAME>
   <MANUFACTURER>SanDisk Corporation</MANUFACTURER>
   <MAKE>MicroStar Internatioal</MAKE>
   <SECURITYLEVEL>2000</SECURITYLEVEL>
   <FEATURES>
        <CLOCK>2</CLOCK>
	  <SECURECLOCK>
		<URL>http://go.microsoft.com/fwlink/?LinkId=25817</URL>
		<PUBLICKEY>
!CNhvvz1WaNV1AFUmetxkvm9iD4UrE9cnGUi!qcqdxMiXmD1*ikYGA==
</PUBLICKEY>
	  </SECURECLOCK>
        <METERING>1</METERING>
        <LICENSE_ACQ>1</LICENSE_ACQ>
        <LICENSE_SYNC>1</LICENSE_SYNC>
        <ENCRYPTION>1</ENCRYPTION>
    <SYMMETRIC_OPT>1</SYMMETRIC_OPT>
    </FEATURES>
    <LIMITS>
        <MAXCHAINDEPTH>2</MAXCHAINDEPTH>
        <MAXLICENSESIZE>10240</MAXLICENSESIZE>
        <MAXHEADERSIZE>5120</MAXHEADERSIZE>
    </LIMITS><PUBLICKEY>n4ahYQBHQ72FRfkzvy7BruWYDSilgfObLpzG0M8SNcfDGWvJhvbrhA==</PUBLICKEY></DATA><MSDRM_SIGNATURE_VALUE>lB5HvVHvcXLb0QiYfskM3Wu0eXtx9Tw0QIiCoKLhBIer0k3ablA4Zg==</MSDRM_SIGNATURE_VALUE></CERTIFICATE><CERTIFICATE type="AUTHORIZATION"><DATA><SECURITYLEVEL>2000</SECURITYLEVEL><AUTH_ID>961</AUTH_ID><PUBLICKEY>vjU5IwzlqSww/T8ihHxTDmbw1hVeXXG8oNVvgBBYFinhSvQ1e0gNEQ==</PUBLICKEY></DATA><MSDRM_SIGNATURE_VALUE>3DU5omHe8sFqztXjYZ9vNr2/DkLabfYH5VIfWrf+XXA+RNASNDpnTg==</MSDRM_SIGNATURE_VALUE></CERTIFICATE><CERTIFICATE type="AUTHORIZATION_ROOT"><DATA><AUTH_ID>1</AUTH_ID><PUBLICKEY>a1t3hxrg!qbOgktnbYaEEi4teCse!gz6RvTPuC!zizKJlpU7xoduSw==</PUBLICKEY></DATA><MSDRM_SIGNATURE_VALUE>sw5Aa1lOYIBJ6TcDvUa1Dxd2HicA66aj6r/YW2pFvx9L8Oiy/zawbQ==</MSDRM_SIGNATURE_VALUE></CERTIFICATE></DEVCERT>
OK.