This chapter proposes the binary compatibility object model for C++ (BiCOMC) to provide the binary compatibility of software components in order to share objects among C++ based executable files such as .exe, .dll, and .so. In addition, the proposed model provides the method overriding and overloading, multiple inheritance, and exception handling. This chapter illustrates how to use the proposed model via a simple example in the Windows and Linux environment. The proposed method is validated by application examples and comparisons with known object models such as C++, COM, and CCC in terms of the call time of a method during execution and the binary compatibility such as reusability due to interface version and the types of compilers. Also this chapter shows that BiCOMC-based components compiled with Microsoft Visual C++ and GCC can call each other and the interface version problems are resolved.