Works nicely for me! 
Here's the HTML code I copy pasted from another post, together with the file attached in this post by muttbarker - it works nicely.
"
<html>
<head>
<title>ProperRDP Applet</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<!--
Notes:
1) << CODEBASE >> is a system value that will get replaced at the time the applet is launched. Please do not modify this value.
2) Please modify the remaining values as needed.
3) Please make sure all attribute names/values are enclosed in double quotes.
-->
<body>
<applet code="net.propero.rdp.applet.RdpApplet.class"
codebase="<< CODEBASE >>"
archive="properJavaRDP14-1.1.jar,properJavaRDP13-1
width="640" height="480"
name="ProperRDP" align="top">
<param name="code" value="net.propero.rdp.applet.RdpApplet.class">
<param name="codebase" value="<< CODEBASE >>">
<param name="archive" value="properJavaRDP14-1.1.jar,properJavaRDP13-1.1
<param name="cabbase" value="">
<param name="name" value="ProperRDP">
<param name="width" value="640">
<param name="height" value="480">
<param name="align" value="top">
<!--
Please specify additional params here after the comment.
<param name="paramname" value="paramvalue">
-->
<param name="Server" value="<<HOST>>">
<param name="Port" value="<<PORT>>">
<param name="Username" value="<< user >>">
</applet>
</body>
</html>
"
