Adobe Illustrator - set overprint to false

setOverprintToFalse.js

var myDocument = activeDocument,
numberOfChangedItems = 0; // counts the number of items with overprint stroke or fill

//loop through all path items and set overprint to false:
for (var i = 0; i < myDocument.pathItems.length; i++) {
    var myPath = myDocument.pathItems[i];
    if (myPath.strokeOverprint == true | myPath.fillOverprint == true){numberOfChangedItems++;};
    if (myPath.strokeOverprint == true){myPath.strokeOverprint = false; myPath.selected=true;};
    if (myPath.fillOverprint == true){myPath.fillOverprint = false; myPath.selected=true;};
}
alert(numberOfChangedItems + " objects were changed." );