This property will either be AnnFormat if the file contains valid LEADTOOLS Annotations data or AnnFormat.Unknown if the file doesn't contain valid LEADTOOLS Annotations data.
For an example, refer to GetInfoAsync
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