C extension (Eg: MySourceFile.C).Compiler would automatically do the rest. So create a Win32 C++ project and save your source file with a. In Visual Studio,there is no longer an option for creating a C project.
The tutorial is aimed at Software/Embedded developers who may want to interface real world sensors like DAQ's,USB Relays,USB GPIO boards ,Temperature sensors,Humidity sensors etc to Windows PC. Here i am assuming that you are using a Virtual COM port based any of the numerous IC's available on the market. This tutorial teaches you to program your Windows PC to communicate with an external peripheral like data acquisition boards, USB GPIO Boards,Relay boards etc through its serial port (Virtual or Real).