Just specify the file names with the extension .c, they will be compiled as C. In addition, you can specify that a particular file should be compiled as C (regardless of the file name extension) in the project settings. Nothing more to do.
Note that one annoyance of this IDE is that its syntax highlighting (and some others) is for C ++. It will highlight C ++ keywords in C code, which is pretty annoying. Functions such as IntelliSense also do not work properly with C ++ keywords in C code.
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