BMP Wrap is a simple and easy to use tool which lets you hide any file inside a valid .BMP shell i.e you can hide data file of any type inside a .bmp image and send it anywhere and recipient can extract that file using BMP Wrap.
With BMP Wrap you can send exe, dll and other types of files which you were not able to send as email attachment as the destination mail server will never be able to find out about the hidden file inside the .BMP image file.