WebStart not recognizing installed jre

I have problem with WebStart - I'm not able to run ANYTHING with my installed jres.
I have two JREs installed. One is 1.4.0rc, second 1.4.1beta1. Yes, I know that both of them are not final releases, but there should be a way to run webstart app even with them, doesn't it ?
I'm using
<j2se version="1.4*"/>
No luck. I have also tried 1.4+, 1.4.0-rc, 1.4.1-beta - every time it dumps out.
Web start is taken from 1.4.1beta1 (which means it is 1.2beta).
javaws.cfg follows
javaws.cfg.jre.0.platform=1.4
javaws.cfg.jre.0.location=http\://java.sun.com/products/autodl/j2se
javaws.cfg.jre.0.product=1.4.0-rc
javaws.cfg.jre.2.path=c\:\\java\\jre1.4.1b1\\bin\\javaw.exe
javaws.cfg.jre.2.platform=1.4
javaws.cfg.jre.2.location=http\://java.sun.com/products/autodl/j2se
javaws.cfg.jre.0.path=C\:\\Program Files\\Java\\j2re1.4.0-rc\\bin\\javaw.exe
javaws.cfg.jre.2.product=1.4.1-beta
Table in WebStart preferences:
1.4 1.4.0-rc http://java.sun.com/products/autodl/j2se C:\Program Files\Java\j2re1.4.0-rc\bin\javaw.exe true
1.4 1.4.1-beta http://java.sun.com/products/autodl/j2se c:\java\jre1.4.1b1\bin\javaw.exe true
Has anybody any idea what is happening ?

The easiest thing to do is to run the application amanger, go to preferences/java and edit the lines that say
1.4.0-rc and 1.4.1-beta. You can change them directly in the table to say 1.4.0 and 1.4.1 and then javaws will think they are fcs versions.

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