FormatPeek

MPP file guides

Straightforward help for opening, understanding and safely viewing Microsoft Project files.

Claire Bennett, FormatPeek editorial persona
FormatPeek Editorial TeamPresented by Claire Bennett, editorial personaPublished September 10, 2026 · Updated September 10, 2026
What is an MPP file?Understand the format and the information it contains.How to open an MPP fileView a project without installing Microsoft Project.Supported MPP filesFile requirements, limits and compatibility.MPP troubleshootingFix common upload and parsing problems.MPP views explainedGantt, task, resource, calendar and network views.File securityHow temporary uploads and browser data are handled.