diff --git a/lib/galaxy/datatypes/larch.py b/lib/galaxy/datatypes/larch.py
index 212f41af1a00..160e9eadea32 100644
--- a/lib/galaxy/datatypes/larch.py
+++ b/lib/galaxy/datatypes/larch.py
@@ -88,7 +88,7 @@ def extract_arg(args: List[str], arg_name: str):
             except ValueError:
                 return
 
-        headers = get_headers(dataset.file_name, sep=" = ", count=3, comment_designator="#")
+        headers = get_headers(dataset.get_file_name(), sep=" = ", count=3, comment_designator="#")
         args = []
         for header in headers:
             if header[0] == "@args":
@@ -104,7 +104,7 @@ def extract_arg(args: List[str], arg_name: str):
 
     def set_peek(self, dataset: DatasetProtocol, **kwd) -> None:
         if not dataset.dataset.purged:
-            dataset.peek = get_file_peek(dataset.file_name)
+            dataset.peek = get_file_peek(dataset.get_file_name())
             dataset.info = (
                 f"atsym: {dataset.metadata.atsym}\n"
                 f"bkg_e0: {dataset.metadata.bkg_e0}\n"
@@ -201,7 +201,7 @@ def set_meta(self, dataset: DatasetProtocol, overwrite: bool = True, **kwd) -> N
         Extract metadata from TITLE
         """
         title_block = ""
-        headers = get_headers(dataset.file_name, sep=None, comment_designator="*")
+        headers = get_headers(dataset.get_file_name(), sep=None, comment_designator="*")
         for header in headers:
             if header and header[0] == "TITLE":
                 title_block += " ".join(header[1:]) + "\n"
@@ -210,7 +210,7 @@ def set_meta(self, dataset: DatasetProtocol, overwrite: bool = True, **kwd) -> N
 
     def set_peek(self, dataset: DatasetProtocol, **kwd) -> None:
         if not dataset.dataset.purged:
-            dataset.peek = get_file_peek(dataset.file_name)
+            dataset.peek = get_file_peek(dataset.get_file_name())
             dataset.info = dataset.metadata.title_block
 
         else: