[3.13] gh-100256: Skip inaccessible registry keys in the WinAPI mimetype implementation (GH-122047) (#122786)

gh-100256: Skip inaccessible registry keys in the WinAPI mimetype implementation (GH-122047)
(cherry picked from commit 0bd93755f37e6b8beb597787fce39eb141179965)

Co-authored-by: Lucas Esposito <LucasEsposito@users.noreply.github.com>