diff --git a/src/AutoGGUF.py b/src/AutoGGUF.py
index 95a7e81..aa67371 100644
--- a/src/AutoGGUF.py
+++ b/src/AutoGGUF.py
@@ -1156,6 +1156,14 @@ def create_label(self, text, tooltip):
         label.setToolTip(tooltip)
         return label
 
+    def verify_gguf(self, file_path):
+        try:
+            with open(file_path, "rb") as f:
+                magic = f.read(4)
+                return magic == b"GGUF"
+        except Exception:
+            return False
+
     def load_models(self):
         self.logger.info(LOADING_MODELS)
         models_dir = self.models_input.text()
@@ -1164,34 +1172,48 @@ def load_models(self):
 
         sharded_models = {}
         single_models = []
+        concatenated_models = []
 
-        # Regex pattern to match sharded model filenames
         shard_pattern = re.compile(r"(.*)-(\d+)-of-(\d+)\.gguf$")
+        concat_pattern = re.compile(r"(.*)\.gguf\.part(\d+)of(\d+)$")
 
-        # Load models from the models directory
         for file in os.listdir(models_dir):
+            full_path = os.path.join(models_dir, file)
             if file.endswith(".gguf"):
+                if not self.verify_gguf(full_path):
+                    show_error(self.logger, INVALID_GGUF_FILE.format(file))
+                    continue
+
                 match = shard_pattern.match(file)
                 if match:
-                    # This is a sharded model
                     base_name, shard_num, total_shards = match.groups()
                     if base_name not in sharded_models:
                         sharded_models[base_name] = []
                     sharded_models[base_name].append((int(shard_num), file))
                 else:
                     single_models.append(file)
+            else:
+                match = concat_pattern.match(file)
+                if match:
+                    concatenated_models.append(file)
 
-        # Add imported models
         if hasattr(self, "imported_models"):
             for imported_model in self.imported_models:
                 file_name = os.path.basename(imported_model)
-                if file_name not in single_models:
-                    single_models.append(file_name)
+                if (
+                    file_name not in single_models
+                    and file_name not in concatenated_models
+                ):
+                    if self.verify_gguf(imported_model):
+                        single_models.append(file_name)
+                    else:
+                        show_error(
+                            self.logger, INVALID_GGUF_FILE.format(imported_model)
+                        )
 
-        # Add sharded models to the tree
         for base_name, shards in sharded_models.items():
             parent_item = QTreeWidgetItem(self.model_tree)
-            parent_item.setText(0, f"{base_name} ({SHARDED})")
+            parent_item.setText(0, SHARDED_MODEL_NAME.format(base_name))
             first_shard = sorted(shards, key=lambda x: x[0])[0][1]
             parent_item.setData(0, Qt.ItemDataRole.UserRole, first_shard)
             for _, shard_file in sorted(shards):
@@ -1199,23 +1221,39 @@ def load_models(self):
                 child_item.setText(0, shard_file)
                 child_item.setData(0, Qt.ItemDataRole.UserRole, shard_file)
 
-        # Add single models to the tree
         for model in sorted(single_models):
-            item = QTreeWidgetItem(self.model_tree)
-            item.setText(0, model)
-            if hasattr(self, "imported_models") and model in [
-                os.path.basename(m) for m in self.imported_models
-            ]:
-                full_path = next(
-                    m for m in self.imported_models if os.path.basename(m) == model
-                )
-                item.setData(0, Qt.ItemDataRole.UserRole, full_path)
-                item.setToolTip(0, IMPORTED_MODEL_TOOLTIP.format(full_path))
-            else:
-                item.setData(0, Qt.ItemDataRole.UserRole, model)
+            self.add_model_to_tree(model)
+
+        for model in sorted(concatenated_models):
+            item = self.add_model_to_tree(model)
+            item.setForeground(0, Qt.gray)
+            item.setToolTip(0, CONCATENATED_FILE_WARNING)
 
         self.model_tree.expandAll()
-        self.logger.info(LOADED_MODELS.format(len(single_models) + len(sharded_models)))
+        self.logger.info(
+            LOADED_MODELS.format(
+                len(single_models) + len(sharded_models) + len(concatenated_models)
+            )
+        )
+        if concatenated_models:
+            self.logger.warning(
+                CONCATENATED_FILES_FOUND.format(len(concatenated_models))
+            )
+
+    def add_model_to_tree(self, model):
+        item = QTreeWidgetItem(self.model_tree)
+        item.setText(0, model)
+        if hasattr(self, "imported_models") and model in [
+            os.path.basename(m) for m in self.imported_models
+        ]:
+            full_path = next(
+                m for m in self.imported_models if os.path.basename(m) == model
+            )
+            item.setData(0, Qt.ItemDataRole.UserRole, full_path)
+            item.setToolTip(0, IMPORTED_MODEL_TOOLTIP.format(full_path))
+        else:
+            item.setData(0, Qt.ItemDataRole.UserRole, model)
+        return item
 
     def validate_quantization_inputs(self):
         self.logger.debug(VALIDATING_QUANTIZATION_INPUTS)
@@ -1469,6 +1507,12 @@ def import_model(self):
         )
         if file_path:
             file_name = os.path.basename(file_path)
+
+            # Verify GGUF file
+            if not self.verify_gguf(file_path):
+                show_error(self.logger, INVALID_GGUF_FILE.format(file_name))
+                return
+
             reply = QMessageBox.question(
                 self,
                 CONFIRM_IMPORT,
diff --git a/src/Localizations.py b/src/Localizations.py
index df415d1..7dc00c6 100644
--- a/src/Localizations.py
+++ b/src/Localizations.py
@@ -34,6 +34,15 @@ def __init__(self):
         self.IMPORTING_MODEL = "Importing model"
         self.IMPORTED_MODEL_TOOLTIP = "Imported model: {}"
 
+        # GGUF Verification
+        self.INVALID_GGUF_FILE = "Invalid GGUF file: {}"
+        self.SHARDED_MODEL_NAME = "{} (Sharded)"
+        self.IMPORTED_MODEL_TOOLTIP = "Imported model: {}"
+        self.CONCATENATED_FILE_WARNING = "This is a concatenated file part. It will not work with llama-quantize; please concat the file first."
+        self.CONCATENATED_FILES_FOUND = (
+            "Found {} concatenated file parts. Please concat the files first."
+        )
+
         # GPU Monitoring
         self.GPU_USAGE = "GPU Usage:"
         self.GPU_USAGE_FORMAT = "GPU: {:.1f}% | VRAM: {:.1f}% ({} MB / {} MB)"