diff --git a/js/vendor/download.js b/js/vendor/download.js
index 2a7070ac..81820428 100644
--- a/js/vendor/download.js
+++ b/js/vendor/download.js
@@ -61,7 +61,7 @@
 
 
 		//go ahead and download dataURLs right away
-		if(/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)){
+		if(/^data:([\w+-]+\/[\w+.-]+)?[,;]/.test(payload)){
 
 			if(payload.length > (1024*1024*1.999) && myBlob !== toString ){
 				payload=dataUrlToBlob(payload);
@@ -112,7 +112,7 @@
 
 			// handle non-a[download] safari as best we can:
 			if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
-				url=url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
+				url=url.replace(/^data:([\w\/\-\+\.]+)/, defaultMime);
 				if(!window.open(url)){ // popup blocked, offer direct download:
 					if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){ location.href=url; }
 				}
@@ -124,7 +124,7 @@
 			document.body.appendChild(f);
 
 			if(!winMode){ // force a mime that will download:
-				url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
+				url="data:"+url.replace(/^data:([\w\/\-\+\.]+)/, defaultMime);
 			}
 			f.src=url;
 			setTimeout(function(){ document.body.removeChild(f); }, 333);
@@ -159,4 +159,4 @@
 		}
 		return true;
 	}; /* end download()*/
-}));
\ No newline at end of file
+}));