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I was unable to open form under JDK1.2.2 ("form format is not recognized" dialog occured and only editor was opened - no form). I think this has for 95% same root as: http://www.netbeans.org/issues/show_bug.cgi?id=10987
*** This issue has been marked as a duplicate of 10987 ***
Resolved for 3.3.x or earlier, no new info since then -> closing.