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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?

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Have you tried openproj – Achu Feb 7 '12 at 20:19

Project Libre has superseded OpenProj and claims Project 2010 compatibility. is the homepage gives some history on how OpenProj forked to give rise to Project Libre.

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Works on linux (checked the rpm version). Versions for MAC and Windows are also available (java, should be cross platform). – Doncho Gunchev Mar 20 '14 at 13:17

Try MPP Viewer. It works great.

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MPP Viewer is windows only (.net 4.5 or something like that). – Doncho Gunchev Mar 20 '14 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.

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Hi. But OpenProj don't open all versions. There's an other alternative? – Cristian Bravo Feb 10 '12 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.

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