Convert XLM to XLSX (Excel)

The XLM file extension stands for "Excel Macro", a format used in early versions of Microsoft Excel to store macro instructions. Introduced with Excel 4.0 in the early 1990s, XLM files enabled automation of repetitive tasks by recording sequences of actions performed within the spreadsheet. They were pivotal in the evolution of Excel's macro capabilities, which later transitioned to VBA (Visual Basic for Applications). While XLM is largely obsolete now, understanding its role is crucial for grasping the history of Excel's automation features.

The XLSX file extension, standing for "Excel Spreadsheet", represents a widely used format for Microsoft Excel spreadsheets. Introduced in Excel 2007, XLSX replaced the older XLS format, utilizing the Office Open XML (OOXML) standard to store data more efficiently and reduce file size. It supports advanced features such as pivot tables, charts, formulas, and macros, essential for data analysis and reporting in various professional settings. The transition to XLSX provided enhanced security, improved data recovery, and greater compatibility with other software applications, solidifying its status as a pivotal tool in data management and business intelligence.