diff --git a/packages/python/port/platforms/chatgpt.py b/packages/python/port/platforms/chatgpt.py
index 420e774..26bcb69 100644
--- a/packages/python/port/platforms/chatgpt.py
+++ b/packages/python/port/platforms/chatgpt.py
@@ -58,6 +58,7 @@ DDP_CATEGORIES = [
         known_files=[
             "chat.html",
             "conversations-000.json",
+            "conversations.json",
             "message_feedback.json",
             "model_comparisons.json",
             "user.json"
@@ -129,7 +130,9 @@ def conversations_to_df(reader: ZipArchiveReader, errors: Counter) -> pd.DataFra
           ]
         }
     """
-    results = reader.json_all(r"conversations-.*\.json")
+    # Prototype change: also accept the older single-file layout (conversations.json).
+    # Anchored so that shared_conversations.json is not picked up.
+    results = reader.json_all(r"(^|/)conversations(-\d+)?\.json$")
     if not results:
         return pd.DataFrame()
     conversations = [conv for result in results for conv in result.data]