diff --git a/pynxtools/dataconverter/readers/xrd/reader.py b/pynxtools/dataconverter/readers/xrd/reader.py
index 000474dab..c9c2fe730 100644
--- a/pynxtools/dataconverter/readers/xrd/reader.py
+++ b/pynxtools/dataconverter/readers/xrd/reader.py
@@ -52,7 +52,7 @@
 # }
 
 REPLACE_NESTED: Dict[str, str] = {}
-XRD_FILE_EXTENSIONS = [".xrdml", ".udf", ".raw", ".xye"]
+XRD_FILE_EXTENSIONS = [".xrdml", "xrdml", ".udf", ".raw", ".xye"]
 
 
 def get_template_from_nxdl_name(nxdl_name):
@@ -89,7 +89,7 @@ def get_template_from_nxdl_name(nxdl_name):
     if root is None and full_nxdl_path.exists():
         root = ET.parse(full_nxdl_path).getroot()
     else:
-        full_nxdl_path = (def_path, 'base_classes', nxdl_file)
+        full_nxdl_path = Path(def_path, 'base_classes', nxdl_file)
 
     if root is None and full_nxdl_path.exists():
         root = ET.parse(full_nxdl_path).getroot()
@@ -120,9 +120,12 @@ def read(self,
              template: dict = None,
              file_paths: Tuple[str] = None,
              objects: Tuple[Any] = None):
+        """General read menthod to prepare the template.
         """
-            General read menthod to prepare the template.
-        """
+
+        if not isinstance(file_paths, tuple) and not isinstance(file_paths, list):
+            file_paths = (file_paths,)
+        print('   input files: ', file_paths)
         filled_template: Union[Dict, None] = Template()
         eln_dict: Union[Dict[str, Any], None] = None
         config_dict: Dict = {}
@@ -130,6 +133,7 @@ def read(self,
         xrd_file_ext: str = ""
         for file in file_paths:
             ext = "".join(Path(file).suffixes)
+            print('file extension: ', ext)
             if ext == '.json':
                 with open(file, mode="r", encoding="utf-8") as fl_obj:
                     config_dict = json.load(fl_obj)
@@ -147,7 +151,7 @@ def read(self,
                 xrd_dict = parse_and_convert_file(file)
 
         # Feeding xrd data from xrdml type file
-        if xrd_file_ext == ".xrdml":
+        if xrd_file_ext in [".xrdml", "xrdml"]:
             feed_xrdml_to_template(template, xrd_dict, config_dict, eln_dict)
         # Feeding xrd data from udf type file
         elif xrd_file_ext == ".udf":