How to load report from *.qrp in BCBPP 5.0

This fragment worked well in Builder 4.0, but in Builder 5.0
TQRPrinter->Load said "Metafile not valid".
10dat.qrp is definitely report file, any preview form could open it without
any problem. What's wrong?

#include <qrprntr.hpp>
...
  TQRPrinter *myprn;
  myprn=new TQRPrinter;
  myprn->Load(".\\10dat.qrp");  // Here is an error "Metafile not valid"
  delete myprn;