Hi
From the preview it is not possible to change the file name, the system gets it from the caption property on the report & this cannot be changed while the report is running
If however you create and run the report from code, so from a button on the form, you can use the Report.SAVEASPDF option, this will allow you to specify the filename,
This method will not allow the user to preview the report though, it will run in the background
Search for SAVEASPDF in the CSide help to see how it works
Cheers
Nev