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What are the contents of a Gerber "Board Outline" File (.gko)?

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jrkirk:
I'm in my 14th week of developing a "minimalist" PCB Layout Program. The program will only handle the design of a 2-layer board and would be perfect for beginners.

I'm going to use it mostly for designing small development boards that use Atmel AtMega chips.

The layout program is 95% complete and I'm wrapping up the Gerber File and Excellon Drill File Generation.

The only thing missing is the layout of a Gerber Board Outline File (.gko).  I'm sure there's not much to it, just a few lines of text.

If someone could rummage through their Gerber Files and please give me a heads up sample of a Standard Gerber RS-274-D  Board Outline File (.gko). My board is 1.7 inches wide and 1.3 inches high.

It probably starts and ends in accordance with the below snippet.

%FSLAX26Y26*%
%MOIN*%
...so...what goes in here?...
M02*

Thanks much!!!

Thor-Arne:
Here's a small one I made with rounded corners.

jrkirk:
Thanks Thor Arne,
That helped a lot.
My Gerber file generation is now complete.

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