This is because a main program is required for every application project, but, by default, no program is initially associated with it.
这是因为每个应用程序都需要一个主程序，而在缺省情况下并没有初始关联的用户程序。
The main program is the installation program that performs the installation of your application (s) on target computer.
主程序(main program)为安装程序，执行将您的应用程序安装到目标计算机上的过程。
The application's main program is designed with a framework or backplane that optionally loads the required DLLS at runtime where the DLLS are in files separate from the main application on the disk.
设计应用程序的主程序时使用程序框架或底板，这些程序框架或底板在运行时选择性地装入所需的dll，这些dll位于磁盘上同主程序分离的一些文件中。
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