auto launch vb program from associated file extension

I created a VB program to view tif images. I've associated the "tif" extension in windows with this program. When a user doubl-clicks a "tif" file in explorer, how do I obtain the name of the file that was double-clicked so I know what to open?

Thanks

I'm guessing it would be passed to the program as the command line;

Try this in the startup of the program;

If Command$<>"" then
Msgbox "You double-clicked " & Command$
end if

.. you could then use Command$ throughout the program to load the .TIF file

Just make sure to parse it to make sure the file exists (it could have been from a DOS prompt), is even a valid filename, blah blah blah. :)