File created by Priority Matrix, a program used for planning, tracking, and organizing priorities across projects and devices; includes priority information for agendas, tasks, and other action items; used by project managers and also within collaborative team environments for sharing project information.

A PMATRIX file saves a complete representation of a particular project and can be used as template, a backup file, or a way to share a project and all its contents and formatting. PMATRIX files categorize priorities using the Eisenhower method. Users choose from one of four priorities for each task: Critical and Immediate, Critial but not Immediate, Not Critical but Immediate, and Uncategorized.