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XLS is a file extension used for spreadsheet documents created by Microsoft Excel. These files store data in cells arranged in rows and columns, allowing users to perform calculations, create charts, and analyze information efficiently.
XLS files use a proprietary binary format that encodes data, formulas, formatting, and macros within a single file. This format supports complex calculations and embedded VBA scripts, making it versatile for business and academic use.
Originally introduced in the late 1980s as part of early Excel versions, XLS files became the standard format for spreadsheet data exchange. Despite newer formats like XLSX, XLS remains widely supported for compatibility with legacy software and systems.
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