ShellExecute failed

[Roger Kirchner]

I have NT/Emacs 20.4.1 and JDE 2.1.6beta14.  I have an applet Xmas99.java
and a corresponding Xmas99.html.  I can run the applet using appletviewer
from a shell in emacs, but when I try to use JDE/Run Applet, I get
"ShellExecute failed" in the bottom buffer.  I'm using Netscape 4.7

I don't know what to do to

        7.Set up Emacs to use a browser. 

Maybe that is my problem.
Thanks.
Roger Kirchner