Why caffe model is saved as PCX image?

[Nyan Naing]

I am training Deep Learning using caffe.

I saved the model as

string savemodelname = Conf.snapshot_prefix_folder+"/snapshotat_"+ss.str()+".caffemodel";
 caffe::NetParameter net_param;
 net_->ToProto(&net_param);
 caffe::WriteProtoToBinaryFile(net_param, savemodelname);

But it is saved as PCX image (image/vnd.zbrush.pcx) and not in binary.

My OS is Ubuntu16.04.

What is wrong with that? I use c++ for my training.