diff --git a/boot/boot.js b/boot/boot.js
index ddca678da..aa1e0f5bd 100644
--- a/boot/boot.js
+++ b/boot/boot.js
@@ -1771,6 +1771,7 @@ $tw.boot.startup = function(options) {
 	$tw.utils.registerFileType("application/javascript","utf8",".js");
 	$tw.utils.registerFileType("application/json","utf8",".json");
 	$tw.utils.registerFileType("application/pdf","base64",".pdf",{flags:["image"]});
+	$tw.utils.registerFileType("application/zip","base64",".zip");
 	$tw.utils.registerFileType("image/jpeg","base64",[".jpg",".jpeg"],{flags:["image"]});
 	$tw.utils.registerFileType("image/png","base64",".png",{flags:["image"]});
 	$tw.utils.registerFileType("image/gif","base64",".gif",{flags:["image"]});