in Nexus devices. So you can't use your device lika a dumb USB Memory-Stick any more.
Now there is the so called MTP (Media Transfer Protocol) as a replacement.
This is also an advantage for the user, as there is no need to 'unmount' the Device-Storage from the
Android-OS to enable the low-block-level-access to the storage.
And: There is no need for a FAT32 Filesystem on any flash-sotrage on the device - so nobody has to pay
any licence-fees to Microsoft *smile*
Unfortunately there is no support out-of-the-box when you use Windows XP.
When you USB-connect your Nexus then Windows find's a MPT-Device but still
is unable to access is. Bump....
Based on the work of http://forum.xda-developers.com/show....php?t=1291293 you
need just to add a simple Text-Line in the file C:\WINDOWS\inf\wpdmtp.inf
[Generic.NTx86] %GenericMTP.DeviceDesc%=MTP, USB\MS_COMP_MTP
[Generic.NTx86] %GenericMTP.DeviceDesc%=MTP, USB\MS_COMP_MTP %GenericMTP.DeviceDesc%=MTP, USB\VID_18D1&PID_4E42&MI_00
The next time you plug your Nexus 7 answer 'automatic install' if windows asks
you what to do with the new device. And voilà: You see your files in the Windows-File-Explorer.