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@ (Specify a Compiler Response File)
Specifies a compiler response file.
A response file can contain any commands that you would specify on the command line. This can be useful if you are working on a machine (Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition) and your command-line arguments exceed 127 characters.
It is not possible to specify the @ option from within a response file. That is, a response file cannot embed another response file.
From the command line you can specify as many response file options (for example, @respfile.1 @respfile.2) as you want.
To set this compiler option in the Visual Studio development environment
A response file cannot be specified from within the development environment and must be specified at the command line.
To set this compiler option programmatically
This compiler option cannot be changed programmatically.