[badbob001]

From the source, it looks like if the URL starts with 'file://', then it will not access the network:

"\erbrowser-3.0+svnr5508\erbrowser\src\view retrieved 1.c"

    else if (is_local_file(uri))
    {
        // local file, no network needed
    }

...

static gboolean is_local_file(const gchar *uri)
{
    return uri && g_str_has_prefix(uri, "file://");
}