Changing owner of a file in Windows VISTA

I need to change the owner of a file or add a user in the permission list of
a file.

The situation is that i create a file in my setup program. The file have
owner administrator and can't be changed in my application.

So in my setup program i need to grant read/write to the current user after
the file has been created.

Thank you

P.S. hope this is the right group for this question.