Sorry but i don't know of any code that could do this. Maybe some one here knows of coding that will do this, not sure.
Well if you can't find an internal code that can do that, give Advanced systemcare 7 a try. I forgot to mention you have an option to overwrite the file up to 7 times, that is more than enough secure deleting.
Some software when installed will ask if you want this to appear in the right click menu. So if the program mixx suggests does you're going to see that in the same menu you see when you right click to delete a file. So it's not any more effort than deleting the file to start with.
In that program that i suggested does in fact have a right click menu to wipe any file. All you have to do is right click the file you want wiped and then choose how many times you want it over written.