account-financial-reporting/account_financial_report_webkit_xlsx/report/general_ledger.xml

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

    <record id="report_account_account_report_general_ledger_xlsx" model="ir.actions.report.xml">
        <field name="report_type">xlsx</field>
        <field name="report_name">account.account_report_general_ledger_xlsx</field>
        <field eval="[(6,0,[])]" name="groups_id"/>
        <field eval="0" name="multi"/>
        <field eval="0" name="auto"/>
        <field eval="1" name="header"/>
        <field name="model">account.account</field>
        <field name="type">ir.actions.report.xml</field>
        <field name="name">General Ledger XLSX</field>
    </record>

  </data>
</openerp>