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Add longPathForWindows() helper that prefixes extract target directories with \?\ on Windows, bypassing the 260-char MAX_PATH limit. Applied to both WinRAR/UnRAR and 7z arguments. Fixes "Die Syntax für den Dateinamen, Verzeichnisnamen" errors when archive internal directories create deeply nested output paths. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>