diff --git a/scripts/register.py b/scripts/register.py
index f680fd7..9649163 100644
--- a/scripts/register.py
+++ b/scripts/register.py
@@ -6,6 +6,8 @@
 import random
 from argparse import ArgumentParser
 import torchio as tio
+import pathlib
+import platform
 from pathlib import Path
 
 from keymorph.model import KeyMorph
@@ -375,7 +377,7 @@ def get_model(args):
     return registration_model
 
 
-if __name__ == "__main__":
+if __name__ == "__main__": 
     args = parse_args()
 
     # Select GPU
@@ -438,7 +440,13 @@ def get_model(args):
     # Model
     registration_model = get_model(args)
     registration_model.eval()
-
+    
+    # pathlib support for windows OS - use WindowsPath as PosixPath if on windows to unpickle the weights
+    posixpath_backup = pathlib.PosixPath
+    plt = platform.system()
+    if plt == 'Windows':
+      pathlib.PosixPath = pathlib.WindowsPath
+      
     # Checkpoint loading
     if args.registration_model == "keymorph":
         args.load_path = get_foundation_weights_path(
@@ -476,3 +484,4 @@ def get_model(args):
             args,
             save_dir_prefix="",
         )
+    pathlib.PosixPath = posixpath_backup # set PosixPath back to whatever it was before