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Probably a configuration file. Can you give a bit more context where you found the file ?
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Probably a configuration file. Can you give a bit more context where you found the file ?

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Did you find your CFG file on that page ? Which was it ?
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Did you find your CFG file on that page ? Which was it ?

what is .cfg file?

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.