Interactive Reports are saved as .prpti files. Report Designer report files have a .prpt extension. In the User Console, Interactive Reports are displayed with a special icon that differentiates them from reports that are created in Report Designer.
If you want to create a new Interactive Reports template, you must create it in Report Designer and place the template in the Interactive Reports templates directory.
To create a new Interactive Reports template, you must use Report Designer to create a report with certain template-specific properties enabled. The resultant PRPT file is then deployed to the Interactive Reports plugin's template directory.