How can I tell a Content Provider where to store a file related to a record?

Question

I understand, that I can use ContentResolver's "openOutputStream()" to get a writeable stream of a file that is automatically created for my record, if it contains a "_data" attribute. But I can't find any docs on exactly where this file will be created? Can I alter this location?

I'd be better if the provider would create them on the SD card (if there's one).

Thanks.