diff --git a/pipeline.py b/pipeline.py
index bbff9c0..ef88205 100644
--- a/pipeline.py
+++ b/pipeline.py
@@ -1,2 +1,36 @@
+import glob
+import xml.etree.ElementTree as ET
+import os
+
+VERSION_TAGS = {"**/*.Tc*": "ProductVersion", "**/*.tsproj": "TcVersion"}
+CORRECT_VERSION = "3.1.4024.0"
+
+
+def check_versions():
+    """
+    Checks the Twincat version used to create a file.
+    It assumes that the version is stored as an attribute on the top element of the file, the attribute names are
+    listed in VERSION_TAGS.
+    :return: A dictionary of incorrect files and their version numbers
+    """
+    incorrect_files = dict()
+    for file_path, version_attrib in VERSION_TAGS.items():
+        found_files = glob.glob(file_path, recursive=True)
+        if not found_files:
+            print("ERROR: No files of type {} found".format(file_path))
+        for file in found_files:
+            tree = ET.parse(file)
+            try:
+                found_version = tree.getroot().attrib[version_attrib]
+                if found_version != CORRECT_VERSION:
+                    incorrect_files[file] = found_version
+            except KeyError:
+                print("WARNING: No version found for {}".format(file))
+    return incorrect_files
+
+
 if __name__ == "__main__":
-    exit(1)  # Fail the pipeline
+    incorrect_files = check_versions()
+    for file, version in incorrect_files.items():
+        print("ERROR: {} has incorrect version {}, expected version {}".format(file, version, CORRECT_VERSION))
+    exit(len(incorrect_files))  # Exit with non-zero if any bad versions were found