diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/Datapack.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/Datapack.java
index 4039d37a8..beb058876 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/Datapack.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/Datapack.java
@@ -10,9 +10,7 @@ import javafx.collections.ObservableList;
 import org.jackhuang.hmcl.util.*;
 
 import java.io.IOException;
-import java.nio.file.FileSystem;
-import java.nio.file.Files;
-import java.nio.file.Path;
+import java.nio.file.*;
 import java.util.*;
 import java.util.logging.Level;
 
@@ -48,7 +46,40 @@ public class Datapack {
             }
 
         if (isMultiple) {
-            new Unzipper(path, worldPath).setReplaceExistentFile(true).unzip();
+            new Unzipper(path, worldPath)
+                    .setReplaceExistentFile(true)
+                    .setFilter(new Unzipper.FileFilter() {
+                        @Override
+                        public boolean accept(Path destPath, boolean isDirectory, Path zipEntry, String entryPath) {
+                            // We will merge resources.zip instead of replacement.
+                            return !entryPath.equals("resources.zip");
+                        }
+                    })
+                    .unzip();
+
+            try (FileSystem dest = CompressingUtils.createWritableZipFileSystem(worldPath.resolve("resources.zip"));
+                 FileSystem zip = CompressingUtils.createReadOnlyZipFileSystem(path)) {
+                Path resourcesZip = zip.getPath("resources.zip");
+                if (Files.isRegularFile(resourcesZip)) {
+                    Path temp = Files.createTempFile("hmcl", ".zip");
+                    Files.copy(resourcesZip, temp, StandardCopyOption.REPLACE_EXISTING);
+                    try (FileSystem resources = CompressingUtils.createReadOnlyZipFileSystem(temp)) {
+                        FileUtils.copyDirectory(resources.getPath("/"), dest.getPath("/"));
+                    }
+                }
+                Path packMcMeta = dest.getPath("pack.mcmeta");
+                Files.write(packMcMeta, Arrays.asList("{",
+                        "\t\"pack\": {",
+                        "\t\t\"pack_format\": 4,",
+                        "\t\t\"description\": \"Modified by HMCL.\"",
+                        "\t}",
+                        "}"), StandardOpenOption.CREATE);
+
+
+                Path packPng = dest.getPath("pack.png");
+                if (Files.isRegularFile(packPng))
+                    Files.delete(packPng);
+            }
         } else {
             FileUtils.copyFile(path.toFile(), datapacks.resolve(FileUtils.getName(path)).toFile());
         }
diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/CompressingUtils.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/CompressingUtils.java
index 4997a73d3..85f2ace76 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/CompressingUtils.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/CompressingUtils.java
@@ -74,7 +74,7 @@ public final class CompressingUtils {
             // Since Java 8 throws ZipError stupidly
             throw new ZipException(error.getMessage());
         } catch (UnsupportedOperationException ex) {
-            throw new IOException("Not a zip file");
+            throw new IOException("Not a zip file", ex);
         }
     }
 
diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/FileUtils.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/FileUtils.java
index 91c3e5d32..2b2274c6f 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/FileUtils.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/FileUtils.java
@@ -118,7 +118,7 @@ public final class FileUtils {
             @Override
             public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                 Path destFile = dest.resolve(src.relativize(file));
-                Files.copy(file, destFile);
+                Files.copy(file, destFile, StandardCopyOption.REPLACE_EXISTING);
 
                 return FileVisitResult.CONTINUE;
             }
@@ -126,7 +126,7 @@ public final class FileUtils {
             @Override
             public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                 Path destDir = dest.resolve(src.relativize(dir));
-                Files.createDirectory(destDir);
+                Files.createDirectories(destDir);
 
                 return FileVisitResult.CONTINUE;
             }