import deng.fzip.*;
import flash.filesystem.*;
import flash.filesystem.File;

//retrieve the image from the "imgs" folder
var myfile:File = new File("C:/Users/User/Desktop/zip/imgs/myimage.png");

//zipping the image
var zip:FZip = new FZip();
zip.addFile(myfile.name, myfile.data);

//saving the image to the user's desktop
var ba:ByteArray = new ByteArray();
zip.serialize(ba);
ba.position = 0;
var finalZIP:File = File.desktopDirectory.resolvePath("myfile.zip");
var fs:FileStream = new FileStream();
fs.open(finalZIP, FileMode.WRITE);
fs.writeBytes(ba);
fs.close();