Netbeans - Manifest.mf not generated correctly

I imported an project from Eclipse to NetBeans 5.5. In Eclipse, I would update manifest.txt before I exported the jar and it worked correctly.

When I build the project the manifest.mf contains only:

Manifest-Version: 1.0

Ant-Version: Apache Ant 1.6.5

Created-By: 1.6.0_01-b06 (Sun Microsystems Inc.)

No Main-Class: , Class-Path: or other manifest files.

Project -> Properties -> Run contains package.MyMain Class

What did I miss when I imported the file?

[509 byte] By [icesurfera] at [2007-11-27 3:38:18]