How to open files

I am trying to create a few programs that can open other programs...
one is going to be used to open a music file and the other to open other applications.
If anyone can help me it would be greatly appreciated.
About files: http://www.cplusplus.com/doc/tutorial/files.html
Sorry, I can't help you with the program. But - no offense - if you aren't familair with file input/output I think using other programs may be a bit complex.
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