aa.gov/~atw/ferret/make_des</a></p>
<p><a name="_descr_extension" id="_descr_extension"></a></p>
<p align="left"> </p>
<p>Note that Ferret v6.84 and higher will recognize a descriptor file only if the file extension is .des or .DES. When opening the file, use its entire name. Either syntax will work:<br />
 </p>
<pre>
 yes? use file.des
 or
 yes? set data file.des</pre><p>In Ferret v6.85 and higher, files with ".mc" as the extension are also recognized as descriptor files, and in addition "<a href="../com