diff --git a/freqtrade/rpc/api_server/api_backtest.py b/freqtrade/rpc/api_server/api_backtest.py
index 65631add6..088a0a700 100644
--- a/freqtrade/rpc/api_server/api_backtest.py
+++ b/freqtrade/rpc/api_server/api_backtest.py
@@ -273,15 +273,18 @@ def api_backtest_history(config=Depends(get_config)):
 def api_backtest_history_result(filename: str, strategy: str, config=Depends(get_config)):
     # Get backtest result history, read from metadata files
     bt_results_base: Path = config["user_data_dir"] / "backtest_results"
-    fn = (bt_results_base / filename).with_suffix(".json")
+    for ext in [".zip", ".json"]:
+        fn = (bt_results_base / filename).with_suffix(ext)
+        if is_file_in_dir(fn, bt_results_base):
+            break
+    else:
+        raise HTTPException(status_code=404, detail="File not found.")
 
     results: dict[str, Any] = {
         "metadata": {},
         "strategy": {},
         "strategy_comparison": [],
     }
-    if not is_file_in_dir(fn, bt_results_base):
-        raise HTTPException(status_code=404, detail="File not found.")
     load_and_merge_backtest_result(strategy, fn, results)
     return {
         "status": "ended",
@@ -301,9 +304,12 @@ def api_backtest_history_result(filename: str, strategy: str, config=Depends(get
 def api_delete_backtest_history_entry(file: str, config=Depends(get_config)):
     # Get backtest result history, read from metadata files
     bt_results_base: Path = config["user_data_dir"] / "backtest_results"
-    file_abs = (bt_results_base / file).with_suffix(".json")
-    # Ensure file is in backtest_results directory
-    if not is_file_in_dir(file_abs, bt_results_base):
+    for ext in [".zip", ".json"]:
+        file_abs = (bt_results_base / file).with_suffix(ext)
+        # Ensure file is in backtest_results directory
+        if is_file_in_dir(file_abs, bt_results_base):
+            break
+    else:
         raise HTTPException(status_code=404, detail="File not found.")
 
     delete_backtest_result(file_abs)
@@ -320,10 +326,14 @@ def api_update_backtest_history_entry(
 ):
     # Get backtest result history, read from metadata files
     bt_results_base: Path = config["user_data_dir"] / "backtest_results"
-    file_abs = (bt_results_base / file).with_suffix(".json")
-    # Ensure file is in backtest_results directory
-    if not is_file_in_dir(file_abs, bt_results_base):
+    for ext in [".zip", ".json"]:
+        file_abs = (bt_results_base / file).with_suffix(ext)
+        # Ensure file is in backtest_results directory
+        if is_file_in_dir(file_abs, bt_results_base):
+            break
+    else:
         raise HTTPException(status_code=404, detail="File not found.")
+
     content = {"notes": body.notes}
     try:
         update_backtest_metadata(file_abs, body.strategy, content)