Update the Open Dialog to include the prpti file format.
As a reporting user I want to open PRPTI files from within PRD
I believe this is a duplicate of PRD-3452
Tested the issue using the build from source.pentaho.com of build date 03/Jun/2011.
The report definition now includes the .prpti file type.
Validated with 3.9.0-RC1 from 6/6