Desktop ActiveSync Registry Settings

In March I showed how to get the version of a connected device from the desktop. This post documents the rest of the registry settings used to store device information. There are two registry locations, the first at HKEY_CURRENT_USERSoftwareMicrosoftWindows CE Services contains information about the currently connected device. The second, HKEY_CURRENT_USERSoftwareMicrosoftWindows CE ServicesPartners contains information for each of the partnerships established on the desktop PC.


When the device is docked, regardless of whether a partnership is established, the following keys are populated in HKEY_CURRENT_USERSoftwareMicrosoftWindows CE Services:-



  • DeviceHardwareId -String containing a unique Guid for the device

  • DeviceOemInfo – OEM specific string (as returned by SystemParametersInfo using SPI_GETOEMINFO) e.g. WIZA200 (HTC Wizard)

  • DeviceProcessorType – DWORD value – 2577 (ARM) for all Windows Mobile devices

  • DeviceType – string containing platform type (as returned by SystemParamtersInfo using SPI_GETPLATFORMTYPE) e.g. PocketPC or SmartPhone

  • DeviceVersion – DWORD value – see my previous post.

The partnerships are stored with a unique DWORD partnership id e.g.


HKEY_CURRENT_USERSoftwareMicrosoftWindows CE ServicesPartners12345678


There are additional values to describe sync behaviour and some Windows Mobile Device Center specific values e.g. to specify the display icon for a device. Otherwise all of the above values are duplicated here for the partner device, except with some naming differences:-



  • DeviceHardwareId

  • OemInfo

  • ProcessorType

  • DeviceType

  • Version

Each partnership has a directory containing any resources used, this includes the icon etc. The path is retrieved from the DataFolder value. This is a path beneath the users roaming application data folder which you would get using System.Environment.GetFolder(System.Environment.SpecialFolder.ApplicationData)


The icon is specified in DeviceIconFile and if you append this to the path you’ll have the full filename of the icon.

Published by Peter Freeman Foot

Microsoft Windows Development MVP