diff --git a/repository/Grafoscopio-Utils/FileReference.extension.st b/repository/Grafoscopio-Utils/FileReference.extension.st
new file mode 100644
index 0000000..c31c2f2
--- /dev/null
+++ b/repository/Grafoscopio-Utils/FileReference.extension.st
@@ -0,0 +1,6 @@
+Extension { #name : #FileReference }
+
+{ #category : #'*Grafoscopio-Utils' }
+FileReference >> basenameWithoutChecksum [
+	^ (self basenameWithoutExtension splitOn: '--') first
+]