This software is Openproj, it is able to open .mpp files, and save them in XML format so MS Project users could open them.
I've been working in a 180Mb mpp file, and Openproj opened it without any problems.
Openproj has 2 versions:
- Openproj - Free version
- Projects on Demand - Payed version 180$ a year (with support)
I've only tried Openproj, but the prices for extend version are very good.
I give you a screenshot of that 180Mb mpp file I've been working on.
As you can see a very large file, with a lot of information. Openproj is not perfect, but it will.
Another easy to install tool and easy to work, and a lot cheaper in Linux than windows...