The value type depends on the actual field. Check box fields accept string and boolean values while other fields work only with strings. If other type is provided, it will be converted to string.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2