Only those under the first IO are relevant: 
CON
AUX
PRN
CLOCK\$
LPT\d+
COM\d+

[download]
There's also NUL, not listed.

In reply to Re^3: Filenames of "PRN" (or "PrN" etc) on Win32. by ikegami
in thread Filenames of "PRN" (or "PrN" etc) on Win32. by BrowserUk

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