diff --git a/boot/boot.js b/boot/boot.js
index 44dd5b4e3..1bf6814fa 100644
--- a/boot/boot.js
+++ b/boot/boot.js
@@ -2414,7 +2414,7 @@ $tw.boot.initStartup = function(options) {
 	$tw.utils.registerFileType("video/webm","base64",".webm");
 	$tw.utils.registerFileType("video/mp4","base64",".mp4");
 	$tw.utils.registerFileType("audio/mp3","base64",".mp3");
-	$tw.utils.registerFileType("audio/mpeg","base64");
+	$tw.utils.registerFileType("audio/mpeg","base64",[".mp3",".m2a",".mp2",".mpa",".mpg",".mpga"]);
 	$tw.utils.registerFileType("text/markdown","utf8",[".md",".markdown"],{deserializerType:"text/x-markdown"});
 	$tw.utils.registerFileType("text/x-markdown","utf8",[".md",".markdown"]);
 	$tw.utils.registerFileType("application/enex+xml","utf8",".enex");