Convert GNM to XLS (Excel)

The GNM file extension, short for Gnumeric, is used by the Gnumeric spreadsheet application, part of the GNOME Desktop Software. It stores spreadsheet data in rows and columns, supports charts, and other functionalities. GNM files are compressed XML files, similar to XLSX, and can be decompressed using standard utilities like WinZIP. Gnumeric aims to provide an open-source alternative to Microsoft Excel.

The XLS file extension, short for "Excel Spreadsheet", is a legacy format used by Microsoft Excel for storing spreadsheet data. Introduced with Excel 2.0 in 1987, it was the primary format until the introduction of XLSX in 2007. XLS files contain data organized in rows and columns, supporting formulas, macros, and various formatting options, making them essential for data analysis and financial reporting. Despite being replaced by the more robust and secure XLSX format, XLS files remain widely used in many legacy systems and applications.