muk_web/muk_web_preview/static/src/xml/preview_content.xml

<?xml version="1.0" encoding="UTF-8"?>

<!--     
	Copyright (C) 2017 MuK IT GmbH
	
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>. 
-->

<templates>
	<div t-name="ViewerJSFrame" class="o_preview_viewerjs">
		<iframe allowfullscreen="allowfullscreen"
			webkitallowfullscreen="webkitallowfullscreen" 
			t-att-src="url">
		</iframe>
	</div>
	
	<div t-name="UnsupportedContent" class="o_preview_unsupported">
		<div class="o_preview_unsupported_header">
			<h3>Unsupported File Extension</h3>
		</div>
		<div class="o_preview_unsupported_body">
			<div class="col-xs-12 o_preview_unsupported_info">
				<p>
				This file type is currently not supported. By installing further extension via the 
				<a href="https://www.odoo.com/apps/modules/browse?author=MuK%20IT">Odoo App Store</a>
				it is possible to improve the Preview.
				</p>
			</div>
			<div class="col-xs-3 o_preview_unsupported_icon" align="center"> 
            	<div class="o_image" t-att-data-mimetype="mimetype" />
            </div>
            <div class=" col-xs-9"> 
            	<table class="table o_preview_unsupported_table">
            		<tbody>
	                     <tr>
	                       <td>Filename:</td>
	                       <td><t t-esc="title"/></td>
	                     </tr>
	                     <tr>
	                       <td>Type:</td>
	                       <td><t t-esc="mimetype"/></td>
	                     </tr>
	                     <tr>
	                       <td>Extension:</td>
	                       <td><t t-esc="extension"/></td>
	                     </tr>
                   </tbody>
            	</table>
        	</div>
        	<div class="col-xs-12 o_preview_unsupported_download text-center">
        		<a class="btn btn-primary" t-att-href="url">Download</a>
        	</div>
		</div>
	</div>
</templates>