This option has the same effect as specifying the file with double quotation marks in an #include directive on the first line of every source file specified on the command line, in the CL environment variable, or in a command file. If you use multiple /FI options, files are included in the order they are processed by CL.
To set this compiler option in the Visual Studio development environment
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Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.
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Click the C/C++ folder.
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Click the Advanced property page.
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Modify the Force Includes property.
To set this compiler option programmatically