diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index 56f1528b9b..292d0bce94 100755
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -1625,8 +1625,13 @@ class CuraApplication(QtApplication):
             node.setName(os.path.basename(filename))
             self.getBuildVolume().checkBoundsAndUpdate(node)
 
-            extension = os.path.splitext(filename)[1]
-            if extension.lower() in self._non_sliceable_extensions:
+            is_non_sliceable = False
+            filename_lower = filename.lower()
+            for extension in self._non_sliceable_extensions:
+                if filename_lower.endswith(extension):
+                    is_non_sliceable = True
+                    break
+            if is_non_sliceable:
                 self.callLater(lambda: self.getController().setActiveView("SimulationView"))
 
                 block_slicing_decorator = BlockSlicingDecorator()
diff --git a/plugins/GCodeGzReader/GCodeGzReader.py b/plugins/GCodeGzReader/GCodeGzReader.py
index df1b8439cd..52df7f074f 100644
--- a/plugins/GCodeGzReader/GCodeGzReader.py
+++ b/plugins/GCodeGzReader/GCodeGzReader.py
@@ -19,7 +19,7 @@ class GCodeGzReader(MeshReader):
 
     def __init__(self):
         super(GCodeGzReader, self).__init__()
-        self._supported_extensions = [".gcode.gz", ".gz"]
+        self._supported_extensions = [".gcode.gz"]
 
     def read(self, file_name):
         with open(file_name, "rb") as file:
diff --git a/plugins/GCodeGzReader/__init__.py b/plugins/GCodeGzReader/__init__.py
index d1f3cf34b1..67424a7d45 100644
--- a/plugins/GCodeGzReader/__init__.py
+++ b/plugins/GCodeGzReader/__init__.py
@@ -18,5 +18,4 @@ def getMetaData():
 
 def register(app):
     app.addNonSliceableExtension(".gcode.gz")
-    app.addNonSliceableExtension(".gz")  # in some parts only the last extension is taken. Let's make it a non sliceable extension for now
     return { "mesh_reader": GCodeGzReader.GCodeGzReader() }