Simple Export to File

export.html

{exp:http_header 
    content_disposition="attachment" 
    filename="myfile.xls" 
    content_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
}
<table>
    <thead>
        <tr>
            <th>Entry ID</th>
            <th>Title</th>
            <th>Author</th>
            <th>Created</th>
            <th>Updated</th>
            <th>Status</th>
            <th>Tool File</th>
            <th>Tool URL</th>
        </tr>
    </thead>
    <tbody>
        {exp:channel:entries
            channel="tools"
            disable="category_fields|member_data|pagination"
            dynamic="no"
            limit="999"
        }
            <tr>
                <td>{entry_id}</td>
                <td>{title}</td>
                <td>{author}</td>
                <td>{entry_date format="%Y-%m-%d-%H:%i"}</td>
                <td>{edit_date format="%Y-%m-%d-%H:%i"}</td>
                <td>{status}</td>
                <td>{tool_file}</td>
                <td>{tool_url}</td>
            </tr>
        {/exp:channel:entries}
    </tbody>
</table>

This sample was pulled from StackExchange and posted by Alex Kendrick in 2015.
It requires the http header plugin be active in the Add-Ons panel.