Hi! I'd suppose you can use EM_GETRECT and EM_SETRECT just like any other windows message sent to your RTB. The declaration of SendMessage is something like this: [DllImport("user32.dll")] private static extern int SendMessage(IntPtr hWnd, int msg, IntPtr wPar, IntPtr lPar); Then you can use this function to send the messages to your RTB. The last parameter (lPar) is used for the rectangle. You can use the Marshal.StructureToPtr() and Marshal.PtrToStructure() methods to transfer the rectangle data to your working structures. That should do the trick... Regards, mav -- Black holes are the places where god divided by 0...

Just to clarify... I'm not asking how to create a thumbnail of any given image. Fortunately, there are a ton of resources out there on that topic. I'm asking how to apply a "preview thumbnail" to a file so that when the user is browsing through his harddrive, he'll be able to see it without opening the file. For example, create a drawing in Visio and save the file. Now open the folder which contains the saved Visio document. Change the view style for the folder from "Details" (or "List" or whatever) to "Thumbnails". Instead of seeing the Visio file type icon representing the document, you'll actually see a "preview thumbnail" of the first tab's drawing in the folder. Cool! So how can we achieve the same effect? Thanks! Anthony