Javaws not an option in the opens with

I am not sure why but even though Java Web Start is installed(Windows 2000) on the PC javaws in the opens with for the jnlp file type. I can go and choose it manually but that does not help because. We have an application that checks to see is Web Start is installed before it launches.
So my question is does anyone know why javaws would not show up in the opens with option? I have tried to remove all versions of java and reinstall just the 1.4.2 version that we are using and it does not seem to change anything.

I will explain a little more about Windows:
If you get the *.jnlp file via Internet Explorer, then the web server must return a MIME type of "application/x-java-jnlp-file" or web start probably will not work (I have not actually tried all possibilites).
IE then looks up (I am pretty sure):
HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/x-java-jnlp-file
Gets: Extension: .jnlp
then
HKEY_CLASSES_ROOT\.jnlp
(Default): JNLPFile
Content Type: application/x-java-jnlp-file
HKEY_CLASSES_ROOT\JNLPFile\Shell\Open\Command
(Default): blah\javaws.exe
It then goes through these few more steps (I do not know the exact order but you get the idea) and launches javaws.exe anyway.
Compare this to the simpler (but private) configuration of:
HKEY_CURRENT_USER\Software\Netscape\Netscape Navigator\Viewers
application/x-java-jnlp-file : blah \javaws.exe
They both do the same thing, but Windows abstracts it out so that explorer.exe and iexplorer.exe are using the same information. Some people like it. Some people hat it. I am pretty blah about it, as long as I can understand it somehow and fix it when it breaks.

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