Is it possible to remove overprints on black text in Acrobat 9 Pro?

I have a set of PDFs generated that all have black type that is set to overprint. My goal is to remove the overprints from the black type in Acrobat 9 Professional without flattening the black type into the color behind it (like the Flattener Preview does).  I want the black type to knockout whatever is behind it instead of overprinting.  I would like to know if this is possible for vector objects as well.  I have scoured through the Print Production menu choices and especially the >Preflight>Fixups where I have only found options to turn overprints on.  I even tried to create a new Fixup to do the task, however I couldn't seem to do anything custom - only reproduce what Fixups already exist in the app with a different variable affected. What am I overlooking?  It seems this would be something so simple to do with the amount of other extremely complex pre-press options in Acrobat 9.
In case it's relevant, the PDFs were generated from InDesign CS4, where the text overprints were created automatically by the option being set in the "Appearance of Black" preferance pane (since turned off).  The PDF was generated in the PDF/X-1a:2001 standard and is strictly CMYK with no spots.  I would post a sample but the file is an unposted retail sign that is currently confidential.
My sincerest thanks in advance for any tips as to how this can be done. 
Aaron

This is a work around. Bring the pdf into Illustrator. Go to Select >Object>Text.  In the attributes panel, deselect Overprint. In the Transparency panel, select Knockout Group. In the Appearance panel, check to make sure the black is not overprinting by clicking on the Character entry. If not, try clicking "Clear Appearance" (here I got a little lost.
Resave the pdf file. Your black text should now knock out. You may have to retrap, unless your RIP does that for you.
Hope this helps. (I had to keep trying to get it to work, but I finally did.
Greg Ledger
www.macproductionartist.wordpress.com

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