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On Windows the GetLongPathName API function does not work on some filesystems even if the file exists. In this case we should just use the original long path name and not the GetShortPathName result. See issue #8480.
KWSys provides a platform-independent API to many common system features that are implemented differently on every platform. This library is intended to be shared among many projects, so it has a configurable namespace. Each project should configure KWSys to use a namespace unique to itself. See comments in CMakeLists.txt for details. You are probably reading this file in the source tree of a surrounding project. In that case, see "../README.kwsys" for details of using KWSys in your project.