diff --git a/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/LauncherBackendImpl.java b/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/LauncherBackendImpl.java
index 691a295b..e2c19626 100644
--- a/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/LauncherBackendImpl.java
+++ b/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/LauncherBackendImpl.java
@@ -415,6 +415,9 @@ public Path initVfsDirectory() {
                 }
             }
         }
+        if(LogHelper.isDevEnabled()) {
+            Vfs.get().debugPrint(LogHelper.Level.DEV);
+        }
         return defaultPath;
     }
 }
diff --git a/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/ResourceLayerImpl.java b/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/ResourceLayerImpl.java
index 6aa50a16..751de58a 100644
--- a/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/ResourceLayerImpl.java
+++ b/Launcher/src/main/java/pro/gravit/launcher/runtime/backend/ResourceLayerImpl.java
@@ -4,11 +4,13 @@
 import pro.gravit.launcher.base.vfs.VfsDirectory;
 import pro.gravit.launcher.base.vfs.directory.OverlayVfsDirectory;
 import pro.gravit.launcher.core.backend.LauncherBackendAPI;
+import pro.gravit.utils.helper.LogHelper;
 import pro.gravit.utils.helper.SecurityHelper;
 
 import java.io.IOException;
 import java.net.URL;
 import java.nio.file.Path;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 import java.util.stream.Stream;
@@ -21,14 +23,23 @@ public ResourceLayerImpl(Path basePath, List<Path> overlayList) {
             vfsPath = basePath;
             return;
         }
-        List<VfsDirectory> overlays = Stream.concat(overlayList.stream(), Stream.of(Path.of("")))
-                .map(basePath::resolve)
-                .map(x -> (VfsDirectory) Vfs.get().resolve(x))
-                .filter(Objects::nonNull)
-                .toList();
+        List<VfsDirectory> overlays = new ArrayList<>();
+        overlays.add((VfsDirectory) Vfs.get().resolve(basePath));
+        for(var e : overlayList) {
+            var dir = (VfsDirectory) Vfs.get().resolve(basePath.resolve(e));
+            if(dir != null) {
+                overlays.add(dir);
+            }
+        }
         OverlayVfsDirectory directory = new OverlayVfsDirectory(overlays);
         String randomName = SecurityHelper.randomStringToken();
         vfsPath = Path.of(randomName);
+        if(LogHelper.isDevEnabled()) {
+            LogHelper.dev("Make overlay %s from %s", vfsPath, basePath);
+            for(var e : overlays) {
+                LogHelper.dev("Layer %s", e.getClass().getSimpleName());
+            }
+        }
         Vfs.get().put(vfsPath, directory);
     }
 
diff --git a/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/Vfs.java b/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/Vfs.java
index 992ca4fb..7c94e651 100644
--- a/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/Vfs.java
+++ b/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/Vfs.java
@@ -3,6 +3,7 @@
 
 import pro.gravit.launcher.base.vfs.directory.SimpleVfsDirectory;
 import pro.gravit.launcher.base.vfs.protocol.vfs.VfsURLStreamHandlerProvider;
+import pro.gravit.utils.helper.LogHelper;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -17,6 +18,7 @@
 
 public class Vfs {
     private final VfsDirectory directory;
+    private volatile String name;
     private static final Map<String, Vfs> map = new HashMap<>();
     private static final Vfs defaultImpl = new Vfs();
     static {
@@ -36,8 +38,33 @@ public VfsEntry resolve(Path path) {
         return directory.resolve(path);
     }
 
+    public VfsEntry createDirectories(Path path) {
+        VfsDirectory current = directory;
+        for(int i=0;i<path.getNameCount();++i) {
+            String s = path.getName(i).toString();
+            var value = current.find(s);
+            if(value == null) {
+                value = new SimpleVfsDirectory();
+                if(current instanceof SimpleVfsDirectory simpleVfsDirectory) {
+                    simpleVfsDirectory.put(s, value);
+                } else {
+                    throw new VfsException(String.format("%s not support add new files", path.getParent()));
+                }
+            }
+            if(value instanceof VfsDirectory vfsDirectory) {
+                current = vfsDirectory;
+            } else {
+                throw new VfsException(String.format("%s not a directory", path.getParent()));
+            }
+        }
+        return current;
+    }
+
     public void put(Path path, VfsEntry entry) {
         VfsEntry parent = resolve(path.getParent());
+        if(parent == null) {
+            parent = createDirectories(path.getParent());
+        }
         if(parent instanceof SimpleVfsDirectory dir) {
             dir.put(path.getFileName().toString(), entry);
         } else {
@@ -45,12 +72,29 @@ public void put(Path path, VfsEntry entry) {
         }
     }
 
+    public void debugPrint(LogHelper.Level level) {
+        debugPrint(level, directory, Path.of(""));
+    }
+
+    private void debugPrint(LogHelper.Level level, VfsDirectory vfsDirectory, Path path) {
+        try(var stream = vfsDirectory.getFiles()) {
+            for(var e : stream.toList()) {
+                VfsEntry entry = vfsDirectory.find(e);
+                LogHelper.log(level, String.format("%s - %s", path.resolve(e), entry.getClass().getSimpleName()), false);
+                if(entry instanceof VfsDirectory nextDirectory) {
+                    debugPrint(level, nextDirectory, path.resolve(e));
+                }
+            }
+        }
+    }
+
     public static void register(String name, Vfs vfs) {
         map.put(name, vfs);
+        vfs.name = name;
     }
 
     public static Vfs getByName(String name) {
-        if(name == null) {
+        if(name == null || name.isEmpty()) {
             return defaultImpl;
         }
         return map.get(name);
@@ -74,8 +118,8 @@ public URL getURL(String path) throws IOException {
     }
 
     public URL getURL(Path name) throws IOException {
-        try (InputStream stream = defaultImpl.getInputStream(name)) {
-            return new URI("vfs", null, "/"+name, null).toURL();
+        try (InputStream stream = getInputStream(name)) {
+            return new URI("vfs", this.name, "/"+name, null).toURL();
         } catch (UnsupportedOperationException ex) {
             throw new FileNotFoundException(name.toString());
         } catch (URISyntaxException e) {
diff --git a/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/directory/SimpleVfsDirectory.java b/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/directory/SimpleVfsDirectory.java
index 67908446..d5223545 100644
--- a/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/directory/SimpleVfsDirectory.java
+++ b/LauncherAPI/src/main/java/pro/gravit/launcher/base/vfs/directory/SimpleVfsDirectory.java
@@ -40,7 +40,7 @@ public VfsEntry resolve(Path path)  {
                 return entity;
             }
         }
-        return null;
+        return current;
     }
 
     public VfsEntry remove(String name) {
diff --git a/LauncherAPI/src/test/java/pro/gravit/launcher/VfsTest.java b/LauncherAPI/src/test/java/pro/gravit/launcher/VfsTest.java
new file mode 100644
index 00000000..632591e5
--- /dev/null
+++ b/LauncherAPI/src/test/java/pro/gravit/launcher/VfsTest.java
@@ -0,0 +1,56 @@
+package pro.gravit.launcher;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pro.gravit.launcher.base.vfs.Vfs;
+import pro.gravit.launcher.base.vfs.VfsDirectory;
+import pro.gravit.launcher.base.vfs.VfsEntry;
+import pro.gravit.launcher.base.vfs.directory.OverlayVfsDirectory;
+import pro.gravit.launcher.base.vfs.file.UrlVfsFile;
+
+import java.net.URI;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class VfsTest {
+    @Test
+    public void testVfs() throws Exception {
+        List<Path> paths = List.of(
+                Path.of("test/testfile.txt"),
+                Path.of("test/dir/testfile2.txt")
+        );
+        Map<Path, VfsEntry> testPaths  = new HashMap<>();
+        for(var path : paths) {
+            var file = new UrlVfsFile(URI.create("https://example.com").toURL());
+            Vfs.get().put(path, file);
+            testPaths.put(path, file);
+        }
+        for(var path : testPaths.entrySet()) {
+            Assertions.assertSame(Vfs.get().resolve(path.getKey()), path.getValue());
+        }
+    }
+
+    @Test
+    public void testVfsWithOverlay() throws Exception {
+        List<Path> paths = List.of(
+                Path.of("test/testfile.txt"),
+                Path.of("test/dir/testfile2.txt")
+        );
+        Path prefix = Path.of("base");
+        Map<Path, VfsEntry> testPaths  = new HashMap<>();
+        for(var path : paths) {
+            var file = new UrlVfsFile(URI.create("https://example.com").toURL());
+            Vfs.get().put(prefix.resolve(path), file);
+            testPaths.put(path, file);
+        }
+        Path overlayPrefix = Path.of("oveerlay");
+        OverlayVfsDirectory vfsDirectory = new OverlayVfsDirectory(List.of((VfsDirectory) Vfs.get().resolve(prefix)));
+        Vfs.get().put(overlayPrefix, vfsDirectory);
+        for(var path : testPaths.entrySet()) {
+            Assertions.assertSame(Vfs.get().resolve(overlayPrefix.resolve(path.getKey())), path.getValue());
+        }
+    }
+}