Four companies, including Appleton's Appvion Inc., have agreed to pay NCR Corp. a total of $93 million for costs NCR incurred to clean up the Fox River in Wisconsin from April 2012 through Oct. 1, 2014. Details were included in a regulatory filing from Paperweight Development Corp., the Appleton-based parent company of Appvion Inc. Under the agreement, Appvion, which is the former Appleton Papers Inc., agreed to pay $6 million.