.SXM File Extension
File TypeStarMath Formula
What is an SXM file?
Math formula originally created by StarMath but still supported by Apache OpenOffice Math (previously part of OpenOffice.org), the successor to StarMath; saves a mathematical formula using an older file format before Apache OpenOffice adopted the OpenDocument specification.
NOTE: StarMath originally used .SMF files through version 5. However, StarMath 6 and Apache OpenOffice version 1 both use the SXM format. Apache OpenOffice Math formulas now use the .ODF (OpenDocument Formula) extension.