If you are going to make extensive modifications to your EDU (or other export_descr_ files) consider using a diff/merge tool so you can easily port your changes over to bugfixed versions of the stock files as they are released.
In lieu of good text editors... Kate. Notepad++ second. (I have bad experiences --but, when modding you shouldn't run into any of those-- with Crimson and don't really like it all that much.)
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