/FI   (Name Forced Include File)

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The /FIfilename option causes the preprocessor to process the header file specified by filename. Each filename is included as if it were specified with double quotation marks (") in an #include directive on line 0 of every C or C++ source file specified in the CL environment variable, on the command line, or in any command file. If multiple /FI options are used, the files are included in the order they are processed by CL. The space between /FI and filename is optional.