Where does Visual Studio look for C++ header files?

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Visual Studio looks for headers in this order:

  • In the current source directory.
  • In the Additional Include Directories in the project properties (Project -> [project name] Properties, under C/C++ | General).
  • In the Visual Studio C++ Include directories under Tools → Options → Projects and Solutions → VC++ Directories.
  • In new versions of Visual Studio (2015+) the above option is deprecated and a list of default include directories is available at Project Properties → Configuration → VC++ Directories

In your case, add the directory that the header is to the project properties (Project Properties → Configuration → C/C++ → General → Additional Include Directories).

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