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I tried adding in the &lt;windows.h&gt; line that you have and it worked the first time! Apparently some or all of the Windows API includes require the windows.h header to be included as well. Also, thanks for the additional info on the process object... C++ is so monsterous with all its libraries these days!
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I tried adding in the <windows.h> line that you have and it worked the first time! Apparently some or all of the Windows API includes require the windows.h header to be included as well. Also, thanks for the additional info on the process object... C++ is so monsterous with all its libraries these days!

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When I start a standard form app and type the line #include &lt;shellapi.h&gt; at the top of my form1.h, it sets off &gt;100 errors! A lot of them are redefinition errors. If I don't include the include line, I get a function not defined error.
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When I start a standard form app and type the line #include <shellapi.h> at the top of my form1.h, it sets off >100 errors! A lot of them are redefinition errors. If I don't include the include line, I get a function not defined error.

Invoke shellexecute API call from a windows form .h file

Microsoft Visual C++ (often abbreviated as MSVC or VC++) is an integrated development environment (IDE) product from Microsoft for the C, C++, and C++/CLI programming languages. It features tools for developing and debugging C++ code, especially code written for the Microsoft Windows API, the DirectX API, and the Microsoft .NET Framework. Many applications require redistributable Visual C++ packages to function correctly and are often installed independently of applications, allowing multiple applications to make use of the package while only having to install it once