Fix #10162: Add try/except around _winreg.OpenKey for keys that are
unreadable by all users, e.g., Flash, Silverlight, and Java keys were
causing errors.

We don't currently have a way to grant/deny permissions for a key
via winreg so there are no tests for this.
diff --git a/Misc/NEWS b/Misc/NEWS
index caf1b49..a93cad9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -43,6 +43,9 @@
 Library
 -------
 
+- Issue #10163: Skip unreadable registry keys during mimetypes
+  initialization.
+
 - logging: Made StreamHandler terminator configurable.
 
 - logging: Allowed filters to be just callables.