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It is an obscure use case to have such files if you are not NetBeans developer. But anyway we should be able to edit these files in IDE.
Well, I am not a NB developer, but this issue sounds more like an enhancement proposal (furthermore an enhancement aimed only at NB developers) than a defect. I am changing this issue to ENHANCEMENT, but maybe I am wrong. If it is that case - feel free to change it back to DEFECT and provide some additional information about why you think the issue should be marked as a DEFECT then... [The issue is quite old, is it still valid? I have no idea how to test it:-/...]