diff --git a/src/pymcnp/files/__init__.py b/src/pymcnp/files/__init__.py
index 6f9a97c..4988d4c 100644
--- a/src/pymcnp/files/__init__.py
+++ b/src/pymcnp/files/__init__.py
@@ -1,3 +1,11 @@
 from . import inp
+from . import outp
+from . import ptrac
+from . import utils
 
-__all__ = ['inp']
+__all__ = [
+    'inp',
+    'outp',
+    'ptrac',
+    'utils',
+]