#5924: on Windows, a large PYTHONPATH (more than 255 chars) was completely ignored.
Will backport to 3.0.
diff --git a/Misc/NEWS b/Misc/NEWS
index 1aa84d2..b4e2557 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and Builtins
-----------------
+- Issue #5924: On Windows, a large PYTHONPATH environment variable
+ (more than 255 characters) would be completely ignored.
+
- Issue #4547: When debugging a very large function, it was not always
possible to update the lineno attribute of the current frame.