diff -urN shared-mime-info-1.7.orig/update-mime-database.c shared-mime-info-1.7/update-mime-database.c
--- shared-mime-info-1.7.orig/update-mime-database.c	2015-03-09 15:16:09.000000000 +0100
+++ shared-mime-info-1.7/update-mime-database.c	2016-10-31 19:45:25.890938753 +0100
@@ -61,6 +61,7 @@
 	"x-content",
 	"x-epoc",
 	"x-scheme-handler",
+	"chemical",
 };
 
 /* Represents a MIME type */