How can I define the available File types when the user right-clicks the project folder and chooses "New"?

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See documentation of "Privileged and Recommended Templates" at Package org.netbeans.spi.project.ui.templates.support

Example: `

import org.netbeans.spi.project.ProjectServiceProvider;
import org.netbeans.spi.project.ui.PrivilegedTemplates;

@ProjectServiceProvider(projectType = "org-netbeans-modules-cnd-makeproject", service = PrivilegedTemplates.class)
public class NescPrivilegedTemplates implements PrivilegedTemplates {

    private static final String[] PRIVILEGED_NAMES = new String[]{
        "Templates/Nesc/EmptyTemplate.nc",
        "Templates/Nesc/SimpleTemplate.nc",
    };

    @Override
    public String[] getPrivilegedTemplates() {
        return PRIVILEGED_NAMES;
    }

}

` Taken from Geertjan @ dev@platform.netbeans.org

Further examples: