Dragging file onto program

[Enahs]

Ok, to simplify it lets go with a toy example.

Say I created a program that changes every individual ‘i’ in a txt file to “I”.
But instead of running the program and selecting the file, I want the user to drag the txt file onto the EXE icon (or possible the shortcut?) and it runs the program on that file with default parameters.

I have no clue how hard this will be, hopefully simple!
But I do not no where to begin.

For Windows (XP) but it would be nice if it was universal for Win32.

*edit* Crap, I clicked the wrong board! I ment to put this in the Windows board. I suck!

[Salem]

I think windows does the right thing of running your program with the full pathnames of the files being dropped as command line parameters.
That's argv[] if you're using consoles

[Enahs]

Well I'll be, it does. Doh! Thanks