diff --git a/projects/nat-archive-tool/src/nat/Entry.hx b/projects/nat-archive-tool/src/nat/Entry.hx
index c7f1ccf0..04b9a125 100644
--- a/projects/nat-archive-tool/src/nat/Entry.hx
+++ b/projects/nat-archive-tool/src/nat/Entry.hx
@@ -3,5 +3,5 @@ package nat;
 typedef Entry = {
     id:String,
     components:Map<String, String>,
-    files:Array<String>
+    files:Array<FileRef>
 };
diff --git a/projects/nat-archive-tool/src/nat/EntryRef.hx b/projects/nat-archive-tool/src/nat/EntryRef.hx
new file mode 100644
index 00000000..e5bdde99
--- /dev/null
+++ b/projects/nat-archive-tool/src/nat/EntryRef.hx
@@ -0,0 +1,3 @@
+package nat;
+
+typedef EntryRef = String;
diff --git a/projects/nat-archive-tool/src/nat/FileRef.hx b/projects/nat-archive-tool/src/nat/FileRef.hx
new file mode 100644
index 00000000..2cc37203
--- /dev/null
+++ b/projects/nat-archive-tool/src/nat/FileRef.hx
@@ -0,0 +1,3 @@
+package nat;
+
+typedef FileRef = String;
diff --git a/projects/nat-archive-tool/src/nat/systems/AttachmentSystem.hx b/projects/nat-archive-tool/src/nat/systems/AttachmentSystem.hx
index 6eb65113..3d8e6ab9 100644
--- a/projects/nat-archive-tool/src/nat/systems/AttachmentSystem.hx
+++ b/projects/nat-archive-tool/src/nat/systems/AttachmentSystem.hx
@@ -7,7 +7,7 @@ import haxe.Json;
 
 using haxe.io.Path;
 
-typedef AttachmentProcessor = (Archive, Entry, Array<String>) -> Dynamic;
+typedef AttachmentProcessor = (Archive, Entry, Array<FileRef>) -> Dynamic;
 
 /**
  * Base System that processes Entries based on whether they have file attachments