diff --git a/openupgrade_scripts/scripts/web_editor/17.0.1.0/post-migration.py b/openupgrade_scripts/scripts/web_editor/17.0.1.0/post-migration.py
new file mode 100644
index 000000000000..c540f18e7362
--- /dev/null
+++ b/openupgrade_scripts/scripts/web_editor/17.0.1.0/post-migration.py
@@ -0,0 +1,17 @@
+from openupgradelib import openupgrade
+
+
+def convert_assets(env):
+    for asset in env["ir.asset"].search([("path", "like", ".custom.")]):
+        path_1, extra = asset.path.split(".custom.", 1)
+        bundle_1, bundle_2, path_2 = extra.split(".", 2)
+        path = f"{path_1}.{path_2}"
+        bundle = f"{bundle_1}.{bundle_2}"
+        new_path = f"/_custom/{bundle}{path}"
+        env["ir.attachment"].search([("url", "=", asset.path)]).write({"url": new_path})
+        asset.write({"path": new_path})
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    convert_assets(env)