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  1. or download this
      DeviceIoControl($fh,
    FSCTL_GET_RETRIEVAL_POINTERS,
...
 my $error = Win32::GetLastError();
  print "error-no: $error\n";
  warn "DeviceIoControl->Call: ", Win32::FormatMessage($error) if ($er
+ror);
  2. or download this
    DeviceIoControl($fh,
    FSCTL_GET_RETRIEVAL_POINTERS,
...
    $dwBytesReturned,
    []
) or warn sprintf "DeviceIOControl failed with (%d) '%s'\n", $^E, $^E;