diff --git a/extensions/xml/package.json b/extensions/xml/package.json
index 60b0df42f65..557205cae96 100644
--- a/extensions/xml/package.json
+++ b/extensions/xml/package.json
@@ -54,6 +54,7 @@
           ".rng",
           ".rss",
           ".shproj",
+          ".slnx",
           ".storyboard",
           ".svg",
           ".targets",