Files with .mpt extension are Microsoft Project template files. These contain basic information and structure along with document settings for creating MPP files. Such a template file offers default settings such as schedule or budget information for a particular project. It, however, can not save project-related data such as tasks, resources, or assignments. Once modified, the template files can be saved as standard MPP files for further working with it.
You can also view, edit metadata of many other file formats.Please see the complete list below.