http://blogs.msdn.com/b/benkaras/archive/2006/11/09/writing-properties-6-gps-readwrite-omits-read-only-data-sources.aspxYou'll recall that there are multiple layers in the property system . In particular, the GPS_DEFAULT property system stack for files in the filesystem namespace looks like this: [ Application using GPS_DEFAULT ] [ Coercion Layer ] [ Shell Item LayerenTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/benkaras/archive/2006/11/09/writing-properties-6-gps-readwrite-omits-read-only-data-sources.aspx#1077086Tue, 14 Nov 2006 22:56:30 GMT91d46819-8472-40ad-a661-2c78acb4018c:1077086The Great Flying Tortoise<p>Have you ever felt this before? It's the day after you send your product to manufacturing . You step</p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=1077086" width="1" height="1">