diff --git a/.hgignore b/.hgignore
index 4bee1c27..0edb24ab 100644
--- a/.hgignore
+++ b/.hgignore
@@ -6,7 +6,9 @@
 
 # Files generated by Visual Studio
 \.aps$
+\.ipch$
 \.ncb$
+\.opensdf$
 \.sdf$
 \.suo$
 \.user$