Which template does EA's RunReport() use ?

[blue5teel]

Im writing a Report-Plugin for EA.
I have following code-snippet:

^{project.RunReport(package.PackageGUID, RTFTemplateName, (string) fileName );}

Although the string "RTFTemplateName" might not be valid, the runreport-function runs and generates a report without a warning.
But which template does it use instead ?

thx