a particular file. This is used by SetFileDownloadable with checkFileSignature as true<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>filename</em>&nbsp;</td><td>the name of the file </td></tr>
  </table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>true on success, false on file does not exist. </dd></dl>
    </td>
  </tr>
</table>
<a class="anchor" name="e1" doxytag="AutoPatcher::GenerateSHA1"></a><p>
