Indicates if the item is sparsely cached. A sparsely-cached item exists in the Offline Files cache but not all of its contents ...

Indicates if the item is sparsely cached.  A sparsely-cached item exists in the Offline Files cache but not all of its contents are cached.  Such items are not available offline.  This property is applicable only to File items.  Server, Share, and Directory items will always report a value of False for this property.  Inspect the ItemType property to determine the type of an item.