[RedCat888]

Setting a Windows folder override such as WIN_PD_OVERRIDE_LOCAL_APPDATA to an incomplete UNC path like \\server made platformdirs treat the application name as the share, so user_data_dir came back as \\server\app. 🪟 Overrides now need both a server and a share name, in the plain form and in the extended \\?\UNC\ form, as the UNC path format requires. An incomplete value falls back to the normal folder, like any other invalid override.

The override validation stays the single gate between the environment and the folder lookup. Complete UNC paths, drive-rooted paths and extended paths keep working, and the explanation docs list the rejected shapes.

[RedCat888]

CI status for current head 37000ba7056a70a946a4599ed97a92faf273dfd1: Read the Docs and pre-commit.ci both passed. The four GitHub Actions runs (Release, Changelog, CodeQL, and check) each report action_required and zero jobs. They are awaiting fork-workflow approval; no failing job has executed.

A maintainer with write access needs to use Approve workflows to run on this PR. This account has pull access only. Representative run: check.

Local validation is recorded in the PR description: full suites on native Windows/Python 3.13 and 3.14 (2,048 passed, 350 skipped each), Windows tests on Python 3.11 (208 passed, 20 skipped), 100% changed-line coverage, type checks, formatting, and the documentation build.

[RedCat888]

Validated the extended-UNC correction in b7d6c926e85e36764ea21dd1c93fdedd4910c1b6 on native Windows:

• Full suite, Python 3.14.2: 2,051 passed, 350 skipped.
• Windows suite, Python 3.11.14: 211 passed, 20 skipped.
• ty check src tests: passed.

The cancelled attempt-2 jobs have concurrency annotations saying a higher-priority request was waiting for the same PR. Maintainer-triggered attempt-3 replacements are already running; the release build and changelog replacements have succeeded. No duplicate rerun was requested.