Extract all tags from hstore field

Question

I need to extract (copy) all hstore tags by object id from a postgres 9.2+postgis 2.1 database into an external file for post-processing. Since the keys and values vary per record, and I don't know what the keys or values are, I have to use wildcards.

Regretably, my secret decoder ring seems to have let me down, because nothing I've tried has worked, possibly because all my expertise is in vanilla sql and mysql/mariadb.

Many thanks for help with this.