>I am using vfp6.0
>It seems too complicated that Export to *.pdf and then print it in A4 size???
>My aim is user preivew the report in A4 size..when they print out to the printer, it can enlarge to a3 size.

What is so complicated about that? You can print to a PDF and use Acrobat Reader instead of preview. User can print right from there to any printer/page size that want.