View file templates/add_attachment_body.tpl

<!-- BEGIN attach_on -->
<tr>
<td class="row1">
{RULES}{L_ADD_ATTACH_TITLE}:<br/>
<input type="file" name="fileupload" style="width: 235px;"/><br/>
<input class="subbutton" type="submit" name="add_attachment" value="{L_ADD_ATTACHMENT}"/>
</td>
</tr>
<!-- END attach_on -->