Rational Method Composer can export to Microsoft Project using "File > Export > Microsoft Project.
To import into Microsoft Project 2016, follow these steps:
1. New project
2. Select "Blank project"
3. New project
4. Select "New from Excel workbook"
5. Select the XML file
6. Select the option "Append the data to the active project"
If your website is hosted on a webserver, then you can edit the XML file prior to import to set the URLs to the correct location.