We know that .mpp file extension is a proprietary file format. But, Is there any open source viewer which work with these kind of files?

  • Have you tried openproj
    – Achu
    Feb 7, 2012 at 20:19
  • I wonder which of the options can import recent versions of Microsoft Project... tinkering around with few options got me nowhere so far..
    – matanox
    Mar 14, 2017 at 8:26

5 Answers 5


Project Libre has superseded OpenProj and claims Project 2010 compatibility.

http://www.projectlibre.org/ is the homepage

http://en.wikipedia.org/wiki/OpenProj#Fork_-_ProjectLibre gives some history on how OpenProj forked to give rise to Project Libre.


Try MPP Viewer. It works great.

  • 3
    MPP Viewer is windows only (.net 4.5 or something like that). Mar 20, 2014 at 13:16

OpenProj does work. You'll be able to print an MPP file to a printer or PDF from there. For unconfidential project files you may also find the online converter sites useful.

  • Hi. But OpenProj don't open all versions. There's an other alternative? Feb 10, 2012 at 14:30

I do not think there is an open source viewer on the market. But if you need a viewer to open all versions, you can try the Light version of MOOS Project Viewer. This one is free but limited in functionality. The full version has more features.


You can use Project Viewer or MOOS Project Viewer. Both based on Java so it support multi-platform.

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