I can see C:WindowsSystem32inetsrvappcmd.exe in the folder and dir C:WindowsSystem32inetsrvappcmd.exe also shows the file. But File.Exists(@"C:WindowsSystem32inetsrvappcmd.exe") returns false. I tried File.OpenRead as this article: Why does System.IO.File.Exists(string path) return false? suggested, but still failed (System.IO.FileNotFoundException) Why I can see C:WindowsSystem32inetsrvappcmd.exe in the folder but unable to access it programmatically? Source: Windows..

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