How to open NetBeans forms in IntelliJ IDEA

I'm starting to use IntelliJ IDEA and i want to open my NetBeans Projects in IntelliJ, but when trying to open a form intelliJ it says: "Form file is invalid: No IntelliJ IDEA GUI Designer form file.", i've found that a solution would be  use JFormDesigner Plugin, but i don't like that designer. Does anyone know how to do it? also how to import a NetBeans project to IntelliJ IDEA?

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