Specific programs are not typically universal. There are programming languages that are [for the most part] universal. If you are interested in it, take a look at Java. It is used in Windows, Linux,...
what is the prob. of any prog. open with notepad plz reply me or tell me.
Winzip opens files which are of the format .zip .
Yes. Everything that executes on a computer is a computer program.
Your system, a.k.a. your computer, probably svchost.exe or something like that. It's just like asking, "What program opens programs?".