Command-line error D8048
cannot compile C file 'file-name' with /ZW option
Only C++ source code files can be passed to the compiler when you use the /ZW (Windows Runtime compilation) compiler option.
Remarks
By default, all files in a C++ Universal Windows platform (UWP) project are compiled by using the /ZW compiler option. The /ZW option enables the Windows Runtime compiler extensions, or C++/CX. Unfortunately, /ZW doesn't work on C source files.
You can disable C++/CX compilation selectively for C files in Visual Studio projects. Select your C file in Solution Explorer, then right-click to choose Properties from the shortcut menu. In the Property Pages dialog, select the Configuration Properties > C/C++ -> General property page. Set the Consume Windows Runtime Extension property to No. Choose OK to save your changes.
For more information, see Component Extensions for .NET and UWP.