can not find main form

Hi
I downloaded a c++ program from the net. it came as a zip file. I extracted it and opened it with a visual studio but i don't know which is the main form. I tried to execute the forms one after the other. one of them debugs and when i click on start debugging an empty form like notepad opens. also i have seen a file with the extension.cg but i don't know what i should use to open that one. I am using visual studio 2012.
What do you mean "main form"? What is a "form"? There are no "forms" in C++, you're probably talking about something to do with Microsoft Windows.
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