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On unix platforms, it is safe to re-open fifo's for reading after the first creation if the file is already a fifo, however this is not possible on windows where this triggers a permissions error on the socket path, as you cannot recreate it. We can't transparently handle this in the CreateAndRead handle, because the Access Is Denied error is too generic to reliably be an IO error. Instead, we add an explict API for opening a reader to an existing FIFO, and check to see if the fifo already exists inside the calling package (e.g logmon)