bruh

[kyara-khaslana]

erm have no idea what could possibly go wrong i do have latest python installed tho

[reiserFSs]

Fixed in 74dc7ec. Root cause was run_steam.py importing Unix-only fcntl before argument parsing, so every Windows invocation failed immediately. The runner now keeps fcntl.flock on Unix and uses a stdlib msvcrt one-byte lock on Windows with a guaranteed byte at offset 0, contention retry, and finally-based unlock. Added focused tests for the fcntl-unavailable help/import path, Windows retry and normal/exceptional unlock behavior, and deterministic cross-process exclusion on the current Unix platform. Verified with: python3 -m unittest -v test_run_steam.py test_proxy.py (8 tests, OK) and python3 run_steam.py --help. Native Windows E2E was not run; the Windows backend was exercised by simulation. README now states Python 3.10+ and native-Windows --krsdk-cache-dir guidance.