diff --git a/src/encoded/commands/create_annotated_filenames.py b/src/encoded/commands/create_annotated_filenames.py
index f47cc0ba..79e84c53 100644
--- a/src/encoded/commands/create_annotated_filenames.py
+++ b/src/encoded/commands/create_annotated_filenames.py
@@ -756,12 +756,15 @@ def get_sequencing_and_assay_codes(
     sequencers: List[Dict[str], Any],
     assays: List[Dict[str], Any],
 ) -> FilenamePart:
-    """Get sequencing and assay codes for file."""
+    """Get sequencing and assay codes for file.
+    
+    Returns XX for Reference Genome and Reference Conversion files.
+    """
     sequencing_codes = get_sequencing_codes(sequencers)
     assay_codes = get_assay_codes(assays)
     if len(sequencing_codes) == 1 and len(assay_codes) == 1:
         return get_filename_part(value=f"{sequencing_codes[0]}{assay_codes[0]}")
-    elif file_constants.DATA_CATEGORY_REFERENCE_GENOME in file.get("data_category",""):
+    elif file_constants.DATA_CATEGORY_REFERENCE_GENOME in file.get("data_category","") or file_constants.DATA_CATEGORY_REFERENCE_CONVERSION in file.get("data_category",""):
         return get_filename_part(value="XX")
     errors = []
     if not sequencing_codes:
@@ -820,6 +823,7 @@ def get_analysis(
     value = get_analysis_value(
         software_and_versions, reference_genome_code
     )
+    import pdb; pdb.set_trace()
     if file_format_utils.is_chain_file(file_extension):
         value = f"{value}{ANALYSIS_INFO_SEPARATOR}{get_chain_file_value(file)}"
     if not value:
diff --git a/src/encoded/commands/release_file.py b/src/encoded/commands/release_file.py
index 705bc37d..62abb81d 100644
--- a/src/encoded/commands/release_file.py
+++ b/src/encoded/commands/release_file.py
@@ -198,7 +198,7 @@ def get_file_sets_from_file(self) -> List[dict]:
         )
         mwfrs = ff_utils.search_metadata(search_filter, key=self.key)
         if len(mwfrs) != 1:
-            if file_constants.DATA_CATEGORY_REFERENCE_GENOME not in self.file["data_category"]:
+            if file_constants.DATA_CATEGORY_REFERENCE_GENOME not in self.file["data_category"] and file_constants.DATA_CATEGORY_REFERENCE_CONVERSION not in self.file["data_category"]:
                 self.print_error_and_exit(
                     (
                         f"Expected exactly one associated MetaWorkflowRun, got"
diff --git a/src/encoded/item_utils/file_format.py b/src/encoded/item_utils/file_format.py
index bb1679e1..55987f7a 100644
--- a/src/encoded/item_utils/file_format.py
+++ b/src/encoded/item_utils/file_format.py
@@ -10,4 +10,5 @@ def get_other_allowed_extensions(properties: Dict[str, Any]) -> str:
 
 
 def is_chain_file(properties: Dict[str, Any]) -> bool:
-    return get_standard_file_extension(properties) == "chain.gz"
\ No newline at end of file
+    return get_standard_file_extension(properties) in ["chain.gz","chain"]
+                                                       
\ No newline at end of file