PDF with white text, or not?

OK, so I have and PDF file with some white text according to my own programm, and it seems to be set to overprinting.
I have asked about this subject before, but failed to make myself clear enough. This question will be more clear, at least I hope.
This is the file in question: http://www.4shared.com/document/Sn7nSydh/error_detected.html
In  that file the Adobe PreFlight is NOT detecting white text that is set to overprint, but my own code does...
And this file the Adobe PreFlight and my own code agree, there is white text that is set to overprint: http://www.4shared.com/document/S9-3F59t/GWG_test_file.html
So now for my question. Were am I going wrong? I think I must seek the error in the colors. So we have two colors when puting out text in a PDF; stroking and non-stroking. When the stroking is set to CMYK(0, 0, 0, 0) and the non-stroking is set to CMYK(0,0,0,1) then we really have white text, and when the Graphic State op (overprint) is set to True, the text is set to overprint...
When the stroking is set to CMYK(0,0,0,0) and the non-stroking is set to somthing like CMYK(0.1, 0.4, 0.5, 0.9) the text is not white, so we are done checking??
I you can bare with me one this one. Thanks!

You are correct that each object can have two colors - a stroking color and a fill color - but the only color(s) that are relevant are the one(s) needed by the specific drawing operators.  If you set the stroke color to be something in RGB (for example) and the fill in CMYK, and just fill the object, then RGB is never used and wouldn't be found by a check.  Same is true for things like white overprint.  The text in that PDF is filled and not stroked, so the stroke color isn't relevant.
In addition, for that file, I don't see OP being set to true at any point related to the text.

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