diff --git a/filetypes.xml b/filetypes.xml
index 783bac1..df5f644 100644
--- a/filetypes.xml
+++ b/filetypes.xml
@@ -7,6 +7,7 @@
       <mapping pattern="parse_args.dart" type="PLAIN_TEXT" />
       <mapping pattern=".config" type="PLAIN_TEXT" />
       <mapping pattern=".gitkeep" type="PLAIN_TEXT" />
+      <mapping pattern=".dev" type="PLAIN_TEXT" />
       <mapping pattern="ChangeLog" type="PLAIN_TEXT" />
       <mapping pattern=".test" type="PLAIN_TEXT" />
       <mapping ext="inf" type="PLAIN_TEXT" />