A Build is not a Build. When using Borland C++ Builder 6.0 Professional, pressing the Build button for your project is not likely to produce a new executable, instead it will just compile all the sources to check that they are correct, then not bother linking. In order to ensure that you get a new executable, you have to press the Run button, this will most likely recompile all of the project (even though it was just done), link and execute the new executable. If you are developing DLLs, then you will need to specify a host program in order to get a new executable.