diff --git a/smol/cofe/space/cluster.py b/smol/cofe/space/cluster.py
index 2b6c740f..17576b7b 100644
--- a/smol/cofe/space/cluster.py
+++ b/smol/cofe/space/cluster.py
@@ -193,9 +193,9 @@ def from_file(cls, filename: str):
         """
         filename = str(filename)
 
-        with zopen(filename) as f:
-            contents = f.read()
-        fname = filename.lower()
+        with zopen(filename, mode="rt", errors="replace") as file:
+            contents = file.read()
+        fname = os.path.basename(filename)
 
         if fnmatch(fname, "*.json*") or fnmatch(fname, "*.mson*"):
             return cls.from_str(contents, fmt="json")
diff --git a/tests/test_cofe/test_cluster.py b/tests/test_cofe/test_cluster.py
index b5ce9e33..8d928878 100644
--- a/tests/test_cofe/test_cluster.py
+++ b/tests/test_cofe/test_cluster.py
@@ -1,10 +1,9 @@
-import json
 import os
 from itertools import combinations
 
 import numpy as np
 import pytest
-from ruamel import yaml
+from ruamel.yaml import YAML
 
 from smol.cofe.space import Cluster
 from smol.cofe.space.domain import get_site_spaces
@@ -70,23 +69,24 @@ def test_to_from(cluster, tmpdir):
     cluster2 = Cluster.from_str(yml, "yaml")
     assert cluster == cluster2
 
+    YAML()
     with open(os.path.join(tmpdir, "cluster.yaml"), "w") as f:
-        yaml.dump(yml, f)
+        f.write(yml)
     with open(os.path.join(tmpdir, "cluster.json"), "w") as f:
-        json.dump(js, f)
+        f.write(js)
 
-    # cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.yaml"))
-    # assert cluster == cluster2
-    # cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.json"))
-    # assert cluster == cluster2
+    cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.yaml"))
+    assert cluster == cluster2
+    cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.json"))
+    assert cluster == cluster2
 
-    # cluster.to("yaml", os.path.join(tmpdir, "cluster.yaml"))
-    # cluster.to("json", os.path.join(tmpdir, "cluster.json"))
+    cluster.to("yaml", os.path.join(tmpdir, "cluster.yaml"))
+    cluster.to("json", os.path.join(tmpdir, "cluster.json"))
 
-    # cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.yaml"))
-    # assert cluster == cluster2
-    # cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.json"))
-    # assert cluster == cluster2
+    cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.yaml"))
+    assert cluster == cluster2
+    cluster2 = Cluster.from_file(os.path.join(tmpdir, "cluster.json"))
+    assert cluster == cluster2
 
     with pytest.raises(ValueError):
         cluster.to("bad_format")