This is one complete Project.
The _DATA folder and the Project Manager AUP file have to be in the same place or folder on the computer. They have to have the same name and it has to be the name you gave it when you made the Project.
If you forget, you can open the AUP file in any text editor (TextEdit) and read it. Look for the listing called projname=". It should be somewhere in the top bunch of XML code.
You may not put the AUP file inside the _DATA folder.
Any of that help?
Koz