Preamble File - Who makes it?

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Well, it's half and half. As long as you have a newer version of Output Designer, it will create the JFPREAMBLE_1 (and _2, _3 and so on as needed) and also make a stub JFPREAMBLE for you.

If you want to change the way it's doing things, you need to edit the JFPREAMBLE. You can't edit the others as they will be overwritten every time you recompile the form. Making edits in the JFPREAMBLE, you should put them *after* the ^FILE lines that pull in the other preambles, so that they override whatever might have been in those. Often you'll find yourself copying lines from JFPREAMBLE_1 to JFPREAMBLE and making only minor changes.

I'll probably write an intro to preambles at some point...it is a huge topic, though.