File Property for Activex Controls

hey there! u guys shd have seen controls properties like picture and icon that open up Open Dialouge box with predefined file filters like .bmp etc! Question is how can i have this functionality for my User_Control ?

--------------------------

NOTE : picture n icon are just examples I want to use it for my files, Any thing from .abc to .xyz!

Pictures - use StdPicture or Picture for the property datatype
Font - use StdFont for the property datatype
Colors - use OLE_COLOR for the property datatype

:)