From Forum Nokia Wiki

if (!entry->HasStoreL())
   return;
 
store = entry->ReadStoreL();
 
if (NULL == store)
   return;
 
if (store->AttachmentManagerL().AttachmentCount() <= 0)
{
   delete store;
   store = NULL;
}
 
 
CMsvAttachment* attachment = store->AttachmentManagerL().GetAttachmentInfoL(indexA);
 
if (attachment == NULL)
      return false;
 
TFileName path;
path = attachment->FilePath();
delete attachment;