diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index f317782dc60b42cf5061c450a5775f4d112842d2..f66df6125268a780f6eb7fc42f59213aaba33582 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -517,8 +517,12 @@ class CsstMsDataManager:
 
         """
         assert detector in self.available_detectors
-        fn = f"{self.telescope}_{self.instrument}_{self.project}_{self.obs_type}_{self.exp_start}_{self.exp_stop}_" \
-             f"{self.obs_id}_{detector:02d}_L1_V{self.version}_{post}"
+        if self.ver_sim == "C5.2":
+            fn = f"{self.telescope}_{self.instrument}_{self.project}_{self.obs_type}_{self.exp_start}_{self.exp_stop}_" \
+                 f"{self.obs_id}_{detector:02d}_{post}"
+        else:
+            fn = f"{self.telescope}_{self.instrument}_{self.project}_{self.obs_type}_{self.exp_start}_{self.exp_stop}_" \
+                 f"{self.obs_id}_{detector:02d}_L1_V{self.version}_{post}"
         return os.path.join(self.dir_l1, fn)
 
     def get_bias(self, detector=6):