Problem with Barrel Jack holes drill (GERBER file)

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I almost finish my board and i want to see how its look like the GERBER files and to see if something wrong to correct it. i follows these steps from this video https://www.youtube.com/watch?v=FI-FK6A1cVg&t=5m24s i found a little bit of difference between my KICAD version and video version. like the fomat 4.5 (unit mm) and 4.6 (unit mm). by default the 4.6 is selected. i don’t know what does mean?
http://postimg.org/image/gie7naxjv/

The drill file have .drl extension and didn’t recognized by the Gerber viewer of the kicad, no problem i opened it with an online GERBER VIEWER and the DRILL was recognized. everything seems to be correct except the drill for the 5V barrel jack.
as you know the barrel jack should have a wider holes. in the KICAD it looks what i expect, wider but in the gerber files the holes is just a rounded holes.
i try to download my file to OSHPARK website to see how the drill looks like and i had the same problem.

here’s a picture : http://postimg.org/image/h61dk6q6v/

so what’s the solution?? the .drl recognize only a rounded holes ?? should i create many holes one beside the other and with my drill i try to merge them together ??
in this case the platting between the holes will be lost ??

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Kicad’s built-in gerber viewer shows plated slots just fine.

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But you’re right, other gerber viewers seem to dislike them. The “G85” command [keep tool-bit down] doesn’t seem to be supported by the ones I’ve tried.

If you absolutely need these plated slots, ask the board house how to do it and be prepared to pay extra for it. If they say no, find another one.

At least for hand-assembled boards, I have found that just using large round holes works reasonably well for these kinds of connectors.

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@tizana, OshPark posted guidelines regarding the slots fabrication, take a look: