diff --git a/masque/file/gdsii.py b/masque/file/gdsii.py
index 542fb86..b75c854 100644
--- a/masque/file/gdsii.py
+++ b/masque/file/gdsii.py
@@ -606,10 +606,10 @@ def load_libraryfile(
             stream = io.BufferedReader(gz_stream)       # type: ignore
     else:       # noqa: PLR5501
         if use_mmap:
-            base_stream = open(path, mode='rb', buffering=0)
+            base_stream = path.open(mode='rb', buffering=0)                         # noqa: SIM115
             stream = mmap.mmap(base_stream.fileno(), 0, access=mmap.ACCESS_READ)    # type: ignore
         else:
-            stream = open(path, mode='rb')
+            stream = path.open(mode='rb')          # noqa: SIM115
     return load_library(stream, full_load=full_load, postprocess=postprocess)
 
 
diff --git a/masque/file/utils.py b/masque/file/utils.py
index 95248ae..33f68d4 100644
--- a/masque/file/utils.py
+++ b/masque/file/utils.py
@@ -129,7 +129,7 @@ def clean_pattern_vertices(pat: Pattern) -> Pattern:
 
 
 def is_gzipped(path: pathlib.Path) -> bool:
-    with open(path, 'rb') as stream:
+    with path.open('rb') as stream:
         magic_bytes = stream.read(2)
         return magic_bytes == b'\x1f\x8b'