Unable to open file. This appears to be a makefile. If this is a non-Visual C++ makefile, it cannot be loaded as a project. ...

Unable to open file.
This appears to be a makefile. 
If this is a non-Visual C++ makefile, it cannot be loaded as a project. In order to use it, run the Makefile Project Wizard.
If this is a Visual C++ version 4 project, it has an error or is corrupt, and cannot be loaded.