Working with the Dynamic Template Designer > Customize and Export Report Templates
  
Version 9.2.00
Customize and Export Report Templates
All reports cannot be customized using the Dynamic Template Designer. If a report can be customized, when you select the report, you’ll see both the Customize and Export buttons. The Customize button launches the Dynamic Template Designer tool. The Export button enables exporting a file that will have a file extension of: .rtd.
See also Save a Report Template After Edits.