Why do you need a Microsoft Project viewer? Hence you get a powerful tool with a strong configuration to view any Microsoft Project file. You can zoom in/out, collapse/expand, show/hide, resize, etc. Using MOOS Project Viewer you get the possibility to see project details that no other report can give you. No need to work with printed materials or static reports in different formats (html, pdf, excel, etc.). It is running on any Java enabled platform including Windows, Mac OS X and Linux and it is the perfect solution for project stakeholders to view the project details in a dynamic way. Available views: WBS, Gantt chart, task sheet, resource sheet, resource usage. MOOS Project Viewer is a Microsoft Project viewer that can open any MS Project file type (.mpp.