Cadence ProjectMaster 4.0 supports import and export with Microsoft Project. Microsoft has changed the import and export to a standard ".xml" format.
To ensure import and export continues to function normally with MS Project, right-click on the ProjectMaster 4.0 ".xml" export file. Select "Open with..." and choose Microsoft Project. If you would like to ensure MS Project is the default target the next time you export from ProjectMaster 4.0, make sure to select "Set as default" in the MS Project import dialog.