diff --git a/app/src/main/cpp/AndroidAssetManager.cpp b/app/src/main/cpp/AndroidAssetManager.cpp
index b74505e..f8b369f 100644
--- a/app/src/main/cpp/AndroidAssetManager.cpp
+++ b/app/src/main/cpp/AndroidAssetManager.cpp
@@ -1,5 +1,8 @@
 #include "AndroidAssetManager.h"
 #include "Log.h"
+#include "NativeEngine.h"
+#include <iostream>
+#include <fstream>
 
 #include <game-activity/native_app_glue/android_native_app_glue.h>
 
@@ -26,15 +29,114 @@ bool AndroidAssetManager::loadFile(const char* path, FileBuffer* p_file_buffer)
         return false;
     }
     auto length = static_cast<size_t>(AAsset_getLength64(asset));
-    p_file_buffer->data = buffer, p_file_buffer->size = length;
+    p_file_buffer->data = buffer;
+    p_file_buffer->size = length;
     p_file_buffer->internal = asset;
     return true;
 }
 
 void AndroidAssetManager::releaseFileBuffer(FileBuffer& fb)
 {
-    AAsset_close(reinterpret_cast<AAsset*>(fb.internal));
+    if (fb.internal != nullptr){
+        AAsset_close(reinterpret_cast<AAsset*>(fb.internal));
+    }
     fb.internal = nullptr;
     fb.data = nullptr;
     fb.size = 0;
+}
+
+bool AndroidAssetManager::writeFile(const char* path, const void* data, size_t size)
+{
+    std::string pfad_komplett = "data/data/tech.recreational.kde/" + std::string(path);
+    std::ofstream file;
+    file.open(pfad_komplett, std::fstream::in | std::fstream::out | std::fstream::trunc);
+    if (file.is_open()) {
+        //file << data;
+        if (!file.good()){
+            return false;
+        }
+        if (file.bad()){
+            return false;
+        }
+        if (file.fail()){
+            return false;
+        }
+        if (file.eof()){
+            return false;
+        }
+        file.clear();
+        file.write((const char*)data, size);
+        auto flags = file.flags();
+        if (!file.good()){
+            return false;
+        }
+        if (file.bad()){
+            return false;
+        }
+        if (file.fail()){
+            return false;
+        }
+        if (file.eof()){
+            return false;
+        }
+        std::streamsize size = file.width();
+        file.close();
+        std::cout << "Datei erfolgreich erstellt und beschrieben." << std::endl;
+    } else {
+        std::cout << "Fehler beim Erstellen der Datei." << std::endl;
+    }
+    return true;
+}
+
+size_t AndroidAssetManager::getInternFileSize(const char* path){
+    std::string dir = "data/data/tech.recreational.kde/" + std::string(path);
+    std::ifstream myfile(dir);
+    std::string line;
+    size_t size = 0;
+    if (myfile.is_open()) {
+        while (std::getline(myfile, line)) {
+            size += line.size();
+        }
+        myfile.close();
+    }
+    return size;
+}
+
+bool AndroidAssetManager::loadInternFile(const char* path, FileBuffer* p_file_buffer)
+{
+    p_file_buffer->internal = nullptr;
+    p_file_buffer->data = nullptr;
+    p_file_buffer->size = 0;
+    size_t size = getInternFileSize(path);
+    if (size == 0){
+        return false;
+    }
+    std::string dir = "data/data/tech.recreational.kde/" + std::string(path);
+    std::ifstream myfile(dir);
+    //std::string line;
+    if (myfile.is_open())
+    {
+        p_file_buffer->size = size;
+        char* data = (char*)malloc(size + 1);
+        if (data == nullptr){
+            myfile.clear();
+            myfile.close();
+            return false;
+        }
+        //myfile.get(data, size);
+        std::string line;
+        int pos = 0;
+        while (std::getline(myfile, line)) {
+            size_t line_size = line.size();
+            const char* line_text = line.c_str();
+            memcpy(&data[pos], line_text, line_size);
+            pos += line_size;
+        }
+        data[pos] = '\0';
+        p_file_buffer->data = data;
+        myfile.clear();
+        myfile.close();
+        return true;
+    }
+    return false;
 }
\ No newline at end of file
diff --git a/app/src/main/cpp/AndroidAssetManager.h b/app/src/main/cpp/AndroidAssetManager.h
index 85cb1d3..a48db4b 100644
--- a/app/src/main/cpp/AndroidAssetManager.h
+++ b/app/src/main/cpp/AndroidAssetManager.h
@@ -16,6 +16,16 @@ public:
 
     void releaseFileBuffer(FileBuffer& fb) override;
 
+    /// @brief Write data to a file.
+    /// @param path Path relative to the asset root directory
+    /// @param data Data buffer
+    /// @param size Number of bytes
+    /// @return @c true if writing the file was successfull, @c false otherwise
+    bool writeFile(const char* path, const void* data, size_t size);
+
+    bool loadInternFile(const char* path, FileBuffer* p_file_buffer);
+    size_t getInternFileSize(const char* path);
+
 private:
     AndroidAssetManager();
     ~AndroidAssetManager();
diff --git a/app/src/main/java/tech/recreational/kde/KDEActivity.java b/app/src/main/java/tech/recreational/kde/KDEActivity.java
index 6d9c141..e7ed5d0 100644
--- a/app/src/main/java/tech/recreational/kde/KDEActivity.java
+++ b/app/src/main/java/tech/recreational/kde/KDEActivity.java
@@ -1,7 +1,16 @@
 package tech.recreational.kde;
+import android.app.Application;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.view.View;
+import android.view.Window;
+
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsControllerCompat;
 import androidx.core.view.WindowInsetsCompat;
+import androidx.fragment.app.FragmentManager;
 
 import com.google.androidgamesdk.GameActivity;
 
@@ -10,14 +19,37 @@ public class KDEActivity extends GameActivity {
         System.loadLibrary("kde");
     }
 
+    static Window window;
+
+    public void openLink(String url){
+        try {
+            Uri uri = Uri.parse(url);
+            View view = window.getDecorView().getRootView();
+            Context context = view.getContext();
+            Intent browserIntent = new Intent(Intent.ACTION_VIEW);
+            browserIntent.setData(uri);
+            browserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            PackageManager manager = context.getPackageManager();
+            // Verify that the intent will resolve to an activity
+            if (browserIntent.resolveActivity(manager) != null) {
+                // Here we use an intent without a Chooser unlike the next example
+                context.startActivity(browserIntent);
+            }
+        }
+        catch (Exception e){
+        }
+    }
+
     protected void onResume() {
         super.onResume();
         hideSystemBars();
     }
 
     private void hideSystemBars() {
-        WindowInsetsControllerCompat windowInsetsController = ViewCompat.getWindowInsetsController(
-                getWindow().getDecorView());
+        window = getWindow();
+        View view = window.getDecorView();
+        WindowInsetsControllerCompat windowInsetsController = ViewCompat
+                .getWindowInsetsController(view);
         if (windowInsetsController == null)
             return;
         windowInsetsController.setSystemBarsBehavior(WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE);