Thumbs.db

http://www.forest.impress.co.jp/article/2008/03/24/vistasp1thumbsdb.html
http://www.forest.impress.co.jp/article/2008/04/02/vistasp1thumbsdb2.html
http://hongliang.seesaa.net/article/36488102.html
http://www.petedavis.net/MySite/DynPageView.aspx?pageid=31
http://d.hatena.ne.jp/Seasons/20071230/1199001253
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/ifaces/iextractimage/iextractimage.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/programmersguide/shell_int/shell_int_extending/extensionhandlers/shell_ext.asp

変に独自のファイルを作るより標準のを使った方が良さそう。