view .arcconfig @ 40266:ab04ce6f0674

py3: use str to query registry values on Windows

This blew up launching any command if extdiff processed a tool with a regkey
config.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}