Mpp Viewer
MPP Viewer is a viewer for Microsoft Project files
...Project properties
MPP Viewer 2.0 is more stable version and works well with most of the files 1.0 was not able to work with.
NOTE:
1. MPP Viewer 4.0 needs .Net framework 4.6.2 to run.
2. If you are running Windows XP, Please use MPP Viewer 1.0. Since .Net 4.5 is not available for Windows XP