kBitmapMimeType
status_t err = message->AddMessage(kBitmapMimeType, embeddedBitmap);
const char* const kBitmapMimeType = "image/x-vnd.Be-bitmap";
&& (dragMessage->HasData(kBitmapMimeType, B_MESSAGE_TYPE)
if (message->HasData(kBitmapMimeType, B_MESSAGE_TYPE)
if (message->FindMessage(kBitmapMimeType, &embeddedBitmap)
info.SetType(kBitmapMimeType);