Read Bt attachment problem in 3rd edition phone

I use AttachmentManagerL to query filename of attachment, and the code is shown as below. It works for getting MMS attachment. However, if the message type is KUidMsgTypeBt, it cases KERN-EXEC 3 when calling ReadStoreL, what wrong in the code? Besdies, I also found that if message type is KUidMsgTypeBt, entry->Entry().Attachment() will return EFalse. Why???

I worry CMsvStore not support for Bt message and cannot get the attachment by message store, then I need to apply AllFiles permission to read the attachment by file path


CMsvEntry* inboxContext = iMsvSession->GetEntryL( KMsvGlobalInBoxIndexEntryId );
CleanupStack::PushL( inboxContext );

CMsvEntrySelection* entries = inboxContext->ChildrenL();
CleanupStack::PushL( entries );
for (TInt i=0; i<entries->Count(); i++)
{
  CMsvEntry* entry = iMsvSession->GetEntryL((*entries)[i]);
  CleanupStack::PushL(entry);
  CMsvStore* inboxStore=NULL;
  inboxStore = entry->ReadStoreL();
  CleanupStack::PushL(inboxStore);
  for (TInt k=0;k<inboxStore->AttachmentManagerL().AttachmentCount();k++)
 {
    CMsvAttachment* att =inboxStore->AttachmentManagerL().GetAttachmentInfoL(k);
    fileArray->AppendL(att->AttachmentName());
    delete att;
  }
  CleanupStack::PopAndDestroy(inboxStore);
  CleanupStack::PopAndDestroy(entry);
}

CleanupStack::PopAndDestroy(2,inboxContext);