diff --git a/build.py b/build.py
index 3063cf1..87877c9 100644
--- a/build.py
+++ b/build.py
@@ -12,28 +12,41 @@ import sys
 from pathlib import Path
 
 
+import shutil
+
 def build():
     system = platform.system()
     project_dir = Path(__file__).parent
 
+    dist_dir = project_dir / "dist"
+    
+    # Alte App löschen
+    app_name = "fcco-Converter"
+    if system == "Darwin":
+        old_app = dist_dir / f"{app_name}.app"
+    else:
+        old_app = dist_dir / f"{app_name}.exe"
+        
+    if old_app.exists():
+        if old_app.is_dir():
+            shutil.rmtree(old_app)
+        else:
+            old_app.unlink()
+
     # Basis-Argumente für PyInstaller
     args = [
         sys.executable,
         "-m", "PyInstaller",
         "--onefile",
         "--windowed",
-        "--name", "fcco-Converter",
+        "--name", app_name,
         "--clean",
     ]
 
     # Icon hinzufügen (wenn vorhanden)
     icon_path = project_dir / "icon.ico"
     if icon_path.exists():
-        if system == "Windows":
-            args.extend(["--icon", str(icon_path)])
-        elif system == "Darwin":
-            # macOS braucht .icns – .ico funktioniert trotzdem als Fallback
-            args.extend(["--icon", str(icon_path)])
+        args.extend(["--icon", str(icon_path)])
 
     # Versteckte Imports (die PyInstaller evtl. nicht automatisch findet)
     hidden_imports = [
@@ -66,8 +79,13 @@ def build():
 
     result = subprocess.run(args, cwd=str(project_dir))
     if result.returncode == 0:
+        # Kopiere config.json in den dist Ordner, damit die App sie direkt findet
+        config_src = project_dir / "config.json"
+        if config_src.exists():
+            shutil.copy(config_src, dist_dir / "config.json")
+            
         print()
-        print(f"Build erfolgreich! Ausgabe in: {project_dir / 'dist'}")
+        print(f"Build erfolgreich! Ausgabe in: {dist_dir}")
     else:
         print()
         print(f"Build fehlgeschlagen (Code {result.returncode}).")