xUnit testing framework for C/C++, specialized for Win32 (32/64 bit). cfix requires only little effort to author unit tests, which are compiled and linked into a DLL. The testrunner application provided by cfix allows selectively running tests of one or more of such test-DLLs. Execution and behaviour in case of failing testcases can be highly customized. Moreover, cfix has been designed to work well in conjunction with the Windows Debuggers (Visual Studio, WinDBG).