ir_config_parameter_data.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>

    <data noupdate="1">

        <record id="attachment_location" model="ir.config_parameter">
            <field name="key">ir_attachment.location</field>
            <field name="value">file:///filestore</field>
        </record>

    </data>

</openerp>