Transform rtf with Japanese charakters to pdf?

Hi,

I'm using wptools (V4.25) to create a rtf with Japanese charakters. We are using a report template (Font = MS UI Gothic) and the function (OnMailMergeGetText) of the TWPRichText component to create a rtf file with Japanese charakters (DBCSMode enabled).
That far everything works fine. But when we try to create a pdf file with TWPDFExport (wpdf - V2.6.5) the Japanese charakters are messed up. The following lines are used to create the pdf:

RPTpdfExport.FileName := pdfFileName;
RPTpdfExport.Source := RPTRichText;
RPTpdfExport.Execute;

I already tried to set the charset of the canvas to japanese, but got an exception.

Is it possible to create an pdf with Japanese charakters? What do I have to do?

Thanks in advance,
Kerstin