Index: zotero/chrome/content/zotero/xpcom/attachments.js
===================================================================
--- zotero/chrome/content/zotero/xpcom/attachments.js	(revision 9578)
+++ zotero/chrome/content/zotero/xpcom/attachments.js	(working copy)
@@ -415,7 +415,7 @@
 		Zotero.debug('Linking attachment from URL');
 		
 		// Throw error on invalid URLs
-		var urlRe = /^https?:\/\/[^\s]*$/;
+		var urlRe = /^(https?|evernote|onenote|x-devonthink-item|ftp):\/\/[^\s]*$/;
 		var matches = urlRe.exec(url);
 		if (!matches) {
 			throw ("Invalid URL '" + url + "' in Zotero.Attachments.linkFromURL()");