The Hyperlink data type is not supported by SQL Server so I don't use it. Leave the hyperlink as a text field. If you want a description, add a second field. You can set the display properties of the Hyperlink or the display field to Hyperlink. Then in the double click event, Use the FollowHyperlink method to open the document/webpage/image. As long as the file type is known to Windows, Windows will know how to open the file.