bpo-35306: Avoid raising OSError from pathlib.Path.exists when passed an invalid filename (GH-25529)

diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index 1518d49..ebc2c02 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -33,6 +33,7 @@
 
 _IGNORED_WINERRORS = (
     21,  # ERROR_NOT_READY - drive exists but is not accessible
+    123, # ERROR_INVALID_NAME - fix for bpo-35306
     1921,  # ERROR_CANT_RESOLVE_FILENAME - fix for broken symlink pointing to itself
 )