IOS App open in file and unzip multiple files

Have developed a custom UTI that opens custom files *.LDS file types but need help with code to unzip multiple files and display an HTML file in an UIWebViewController with an UILabel that will show data from the the HTML or Xml file from Zip files. The zip file example is http://www.mastermans.net/TEST.lds which is a zip file that contains a .dat file that needs to be unzipped to show the HTML file that will be displayed in the UIWebViewController. When the LDS file is opened in app it need to be deleted from the sandbox documents/inbox directory after 3hours of the app being active.