Extract windows 10 lock screen images to your desktop

This small toy extract all Windows 10 lockscreen images to a folder on your desktop, and adds a .jpg file extension for easy viewing.

usage:

• Download the jar file at the end of this document to a folder of your choosing
• Execute from a command prompt with ‘java LockscreenExtract’
• Your desktop now has a folder called ‘Extract’ with your images

import java.io.File;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Main {

    private static String OFFSET_DIR = "\\Packages\\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\\LocalState\\Assets";

    /**
     * Extract the windows lockscreen wallpapers to the desktop, and gives the files an extension to make them
     * viewable. Extraction is done for files larger then 100.000 bytes, so we end up with the actual wallpapers
     * while skipping thumbnails and other small stuff.
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        String basedir = System.getenv("LOCALAPPDATA");
        String sourceHandle = basedir + OFFSET_DIR;
        String targetHandle = System.getenv("USERPROFILE") + "\\Desktop\\Extract";
        Path sourcePath = Paths.get(sourceHandle);
        Path targetPath = Paths.get(targetHandle);
        System.out.println("Source   :" + sourceHandle);
        System.out.println("Target   :" + targetHandle);
        if (!Files.exists(targetPath)) {
            Files.createDirectory(targetPath);
        }
        try (DirectoryStream<Path> stream = Files.newDirectoryStream(sourcePath, "*")) {
            for (Path entry : stream) {
                // Require at least 100k bytes to filter out icons and stuff
                File checkHandle = new File(String.valueOf(entry));
                if (checkHandle.length() > 100000) {
                    // rename to jpg to make the image accessible
                    String targetName = entry.getFileName() + ".jpg";
                    Path copyTo = Paths.get(targetPath + "\\" + targetName);
                    // only new files we dont have yet
                    if (!Files.exists(copyTo)) {
                        Files.copy(entry, copyTo);
                        System.out.println("nieuw:   " + entry.getFileName());
                    } else {
                        System.out.println("skipped: " + entry.getFileName());
                    }
                }
            }
        }
    }
}