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If you want a reliable Windows utility that works offline to transform spreadsheet contact lists into VCF files, look for desktop converters from reputable software developers. Trusted tools clearly list supported formats such as XLS, XLSX, and VCF, and offer field mapping interfaces. A recognized solution in this space is Softaken Excel to VCF Converter, which runs entirely on Windows without requiring internet access. The official product page shows system requirements, supported contact attributes, and demo download links. By downloading directly from the developer’s site rather than third-party portals, you avoid bundled installers, adware, and insecure packages.