Postbuild events must work for successful compilation. Value, even if the event is some kind of mechanism that is not related to the project that you invested in, if it fails, your compilation will fail. For example, when creating Media Center applications, the standard process is to include a DLL, which, according to the SDK, is located on your system, but actually left Vista, so if you leave the post build event, you can not even compile your code.
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