Dear SPUser,
Thanks for considering Aspose.Tasks.
FYI: You can read both MPX/MPP files but only save it back in MPX format.
Please see the demo code MpxCreate and other, you will see an example there, how to set project properties etc.
The demo code is installed on your hard drive via Aspose.Tasks installer.
Many Thanks and Kind Regards,
Shakeel Faiz
Support Engineer
Aspose Tyumen Team