diff --git a/Doku/reduce_filesize/filter_zip_no_stl.py b/Doku/reduce_filesize/filter_zip_no_stl.py
index 8d8d2bc..0350807 100644
--- a/Doku/reduce_filesize/filter_zip_no_stl.py
+++ b/Doku/reduce_filesize/filter_zip_no_stl.py
@@ -36,7 +36,8 @@ def filter_zip_no_stl(source_zip_path: str, replace: bool = False) -> str:
     copied_count = 0
     skipped_count = 0
     
-    with zipfile.ZipFile(source_path, 'r') as src_zip:
+    # Öffne ZIP mit metadata_encoding für korrekte Behandlung von Umlauten
+    with zipfile.ZipFile(source_path, 'r', metadata_encoding='utf-8') as src_zip:
         with zipfile.ZipFile(temp_path, 'w', zipfile.ZIP_DEFLATED) as dst_zip:
             for info in src_zip.infolist():
                 # Verzeichnisse überspringen