Using wizard we can make the generated document downloadable on click from the user.

Example:-

wizard\sample_data.py

from osv import fields, osv
import base64
class sample_data(osv.osv_memory):

_name = "sample.data"
_columns = {   
    'data': fields.binary('Export to File',readonly=True),
    'filename': fields.char('File Name', size=128),
    }

_defaults = {'filename' : 'sampleword.doc'}

def action_sample_data(self, cr, uid, ids, context=None):
    this = self.browse(cr, uid, ids)[0]
    output = 'Sample Content Print in the word document'
    self.write(cr, uid, ids,
                   {'data': base64.encodestring(output)},
                   context=context)
    return {
        'type': 'ir.actions.act_window',
        'res_model': 'sample.data',
        'view_mode': 'form',
        'view_type': 'form',
        'res_id': this.id,
        'views': [(False, 'form')],
        'target': 'new',
    }
 

wizard\sample_data._view.xml

  <record id="view_sample_data_form" model="ir.ui.view">
        <field name="name">sample.data.form</field>
        <field name="model">sample.data</field>
        <field name="type">form</field>
        <field name="arch" type="xml">
            <form string="Export">
              <group colspan="4" col="4">               
                 <button  icon="gtk-ok" name="action_sample_data"  string="Generate Data" type="object"/>                
               <field name="data"  filename="filename"/>
            </group>
            </form>
        </field>
    </record>

    <record id="action_generate_data" model="ir.actions.act_window">
        <field name="name">Data</field>
        <field name="res_model">sample.data</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
       <field name="view_id" ref="view_sample_data_form"/>
       <field name="target">new</field>
       <field name="context">{'model':'sample.data'}</field>
    </record>  

   <act_window name="Data"
               res_model="sample.data"
               src_model="sample.data"
               view_mode="form"
               target="new"
               key2="client_action_multi"
               id="window_action_sample_data_download"/>

After clicking the wizard button it will allows the download options in the wizard pop up itself.