diff --git a/boot/boot.js b/boot/boot.js
index 43d625edc..62939b800 100644
--- a/boot/boot.js
+++ b/boot/boot.js
@@ -1954,7 +1954,9 @@ $tw.boot.startup = function(options) {
 	$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");
+	$tw.utils.registerFileType("application/vnd.openxmlformats-officedocument.wordprocessingml.document","base64",".docx");
 	$tw.utils.registerFileType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet","base64",".xlsx");
+	$tw.utils.registerFileType("application/vnd.openxmlformats-officedocument.presentationml.presentation","base64",".pptx");
 	$tw.utils.registerFileType("application/x-bibtex","utf8",".bib");
 	$tw.utils.registerFileType("application/epub+zip","base64",".epub");
 	// Create the wiki store for the app