Microsoft Multiplan (.mp)
MP stands for Multiplan, associated with Microsoft Multiplan, an early spreadsheet program. Introduced in 1982, Microsoft Multiplan was designed for CP/M, MS-DOS, and other operating systems. The MP file extension was primarily used to store spreadsheet data. Despite its initial popularity, Multiplan was eventually overshadowed by Microsoft Excel. Today, MP files are rare, but they hold historical significance in the evolution of spreadsheet software.