{"success":true,"data":{"ext":"123","name":"123","description":"123 is a legacy spreadsheet file format created by Lotus Development Corporation for Lotus 1-2-3, later supported by IBM through its office software products. It was used to store worksheets, formulas, charts, and business data for accounting, planning, and data analysis, and could be opened by compatible spreadsheet applications. As an obsolete format, it is generally safe to inspect, though older files may not preserve all features in modern software.","mime":["application/vnd.lotus-1-2-3;version=97+9.x"],"risk_level":"Safe","signatures":[{"hex":"00 00 1A 00 03 10 04 00","offset":0,"sources":[{"name":"Apache Tika","url":"https://raw.githubusercontent.com/apache/tika/main/tika-core/src/main/resources/org/apache/tika/mime/tika-mimetypes.xml"}]}],"related":["wk3","wk4","apr","lwp","nsf","wk1"],"usage":{"python":"def is_123(file_path: str) -> bool:\n    \"\"\"Check if file is a valid 123 by magic bytes.\"\"\"\n    signature = bytes([0x00, 0x00, 0x1A, 0x00, 0x03, 0x10, 0x04, 0x00])\n    with open(file_path, \"rb\") as f:\n        return f.read(8) == signature","node":"function is123(buffer: Buffer): boolean {\n  const signature = Buffer.from([0x00, 0x00, 0x1A, 0x00, 0x03, 0x10, 0x04, 0x00]);\n  return buffer.subarray(0, 8).equals(signature);\n}","go":"func Is123(data []byte) bool {\n    signature := []byte{0x00, 0x00, 0x1A, 0x00, 0x03, 0x10, 0x04, 0x00}\n    if len(data) < 8 {\n        return false\n    }\n    return bytes.Equal(data[:8], signature)\n}"},"category":"Office"}}