im not sure what program you would use. but you would need to find a program that exports ISO image its an exact copy of a dvd. you need somekind of dvd ripper. but thats all i know about dvd programs.
It depends on the program, some programs are copy-protected, like games and OSs, if it's a program downloaded from Internet and burned on the disk, then you can access it as if it was on a normal folder.