diff --git a/api/js/jsapi/egw_links.js b/api/js/jsapi/egw_links.js
index 08f9c6cab5..5bf2a4fcc7 100644
--- a/api/js/jsapi/egw_links.js
+++ b/api/js/jsapi/egw_links.js
@@ -138,22 +138,31 @@ egw.extend('links', egw.MODULE_GLOBAL, function()
 		/**
 		 * Get mime-type information from app-registry
 		 *
-		 * We prefer a full match over a wildcard like 'text/*' (written as regualr expr. "/^text\\//"
+		 * We prefer a full match over a wildcard like 'text/*' (written as regular expr. "/^text\\//"
 		 *
 		 * @param {string} _type
+		 * @param {number|string} _app_or_num default 1, return 1st, 2nd, n-th match, or match from application _app_or_num only
 		 * @return {object} with values for keys 'menuaction', 'mime_id' (path) or 'mime_url' and options 'mime_popup' and other values to pass one
 		 */
-		get_mime_info: function(_type)
+		get_mime_info: function(_type, _app_or_num)
 		{
+			if (typeof _app_or_num === 'undefined') _app_or_num = 1;
 			let wildcard_mime;
-			for(var app in link_registry)
+			for(const app of isNaN(_app_or_num) ? [_app_or_num] : Object.keys(link_registry))
 			{
 				const reg = link_registry[app];
-				if (typeof reg.mime !== 'undefined')
+				if (typeof reg?.mime !== 'undefined')
 				{
 					for(let mime in reg.mime)
 					{
-						if (mime === _type) return reg.mime[_type];
+						if (mime === _type)
+						{
+							if (isNaN(_app_or_num) || !--_app_or_num)
+							{
+								return reg.mime[_type];
+							}
+							continue;
+						}
 						if (mime[0] === '/' && _type.match(new RegExp(mime.substring(1, mime.length-1), 'i')))
 						{
 							wildcard_mime = reg.mime[mime];
@@ -168,11 +177,12 @@ egw.extend('links', egw.MODULE_GLOBAL, function()
 		 * Get handler (link-data) for given path and mime-type
 		 *
 		 * @param {string|object} _path vfs path, egw_link::set_data() id or
-		 *	object with attr path, optinal download_url or id, app2 and id2 (path=/apps/app2/id2/id)
+		 *	object with attr path, optional download_url or id, app2 and id2 (path=/apps/app2/id2/id)
 		 * @param {string} _type mime-type, if not given in _path object
+		 * @param {number|string} _app_or_num default 1, use 1st, 2nd, n-th match, or match from application _app_or_num only
 		 * @return {string|object} string with EGw relative link, array with get-parameters for '/index.php' or null (directory and not filemanager access)
 		 */
-		mime_open: function(_path, _type)
+		mime_open: function(_path, _type, _app_or_num)
 		{
 			let path;
 			if (typeof _path === 'object')
@@ -198,11 +208,11 @@ egw.extend('links', egw.MODULE_GLOBAL, function()
 			{
 				path = _path;
 			}
-			let mime_info = this.get_mime_info(_type);
+			let mime_info = this.get_mime_info(_type, _app_or_num);
 			let data = {};
 			if (mime_info)
 			{
-				if (this.isCollaborable(_type))
+				if ((typeof _app_or_num === 'undefined' || _app_or_num === 'collabora') && this.isCollaborable(_type))
 				{
 					data = {
 						'menuaction': 'collabora.EGroupware\\collabora\\Ui.editor',
@@ -216,9 +226,16 @@ egw.extend('links', egw.MODULE_GLOBAL, function()
 					switch(attr)
 					{
 						case 'mime_url':
-							data[mime_info.mime_url] = 'vfs://default' + path;
+							if (path)
+							{
+								data[mime_info.mime_url] = 'vfs://default' + path;
+							}
 							break;
 						case 'mime_data':
+							if (!path && _path && typeof _path === 'string')
+							{
+								data[mime_info.mime_data] = _path;
+							}
 							break;
 						case 'mime_type':
 							data[mime_info.mime_type] = _type;
diff --git a/api/js/jsapi/egw_open.js b/api/js/jsapi/egw_open.js
index a8b90a38a8..384e638c32 100644
--- a/api/js/jsapi/egw_open.js
+++ b/api/js/jsapi/egw_open.js
@@ -321,7 +321,7 @@ egw.extend('open', egw.MODULE_WND_LOCAL, function(_egw, _wnd)
 			{
 				url = this.webserverUrl + url;
 			}
-			var mime_info = _mime_type ? this.get_mime_info(_mime_type) : undefined;
+			var mime_info = _mime_type ? this.get_mime_info(_mime_type, _target_app) : undefined;
 			if (mime_info && (mime_info.mime_url || mime_info.mime_data))
 			{
 				var data = {};
diff --git a/api/src/Link.php b/api/src/Link.php
index 87860667d3..5967887221 100644
--- a/api/src/Link.php
+++ b/api/src/Link.php
@@ -83,7 +83,7 @@ namespace EGroupware\Api;
  *          'mime' => array(						// Optional register mime-types application can open
  *          	'text/something' => array(
  *          		'mime_url'  => $attr,			// either mime_url or mime_data is required for server-side processing!
- *          		'mime_data' => $attr,			// md5-hash returned from Link::set_data() to retrive content (only server-side)
+ *          		'mime_data' => $attr,			// md5-hash returned from Link::set_data() to retrieve content (only server-side)
  *          		'menuaction' => 'app.class.method',	// method to call
  *          		'mime_popup' => '400x300',		// optional size of popup
  *          		'mime_target' => '_self',		// optional target, default _blank
@@ -1059,11 +1059,12 @@ class Link extends Link\Storage
 	 * We prefer full matches over wildcards like "text/*" written as regexp "/^text\\//".
 	 *
 	 * @param string $type
+	 * @param ?string $_app check only $_app, if given
 	 * @return array with values for keys 'menuaction', 'mime_id' (path) or 'mime_url' and options 'mime_popup' and other values to pass one
 	 */
-	static function get_mime_info($type)
+	static function get_mime_info($type, string $_app=null)
 	{
-		foreach(self::$app_register as $app => $registry)
+		foreach($_app ? [$_app => self::$app_register[$_app] ?? []] : self::$app_register as $app => $registry)
 		{
 			if (isset($registry['mime']) &&
 				(isset($GLOBALS['egw_info']['user']['apps'][$app]) ||
diff --git a/api/src/MimeMagic.php b/api/src/MimeMagic.php
index 9f8e0d6a56..6e6540e218 100644
--- a/api/src/MimeMagic.php
+++ b/api/src/MimeMagic.php
@@ -200,8 +200,7 @@ class MimeMagic
 	 * a temp file creation and clean up method wrapper for analyze_file()
 	 *
 	 * @param string $data the data to analyze
-	 *
-	 * @param string MIME type false for none.
+	 * @return string|false MIME type false for none.
 	 *
 	 * @author skwashd
 	 */
diff --git a/mail/inc/class.mail_ui.inc.php b/mail/inc/class.mail_ui.inc.php
index 0fbcf26569..76a2cc219c 100644
--- a/mail/inc/class.mail_ui.inc.php
+++ b/mail/inc/class.mail_ui.inc.php
@@ -2527,7 +2527,7 @@ $filter['before']= date("d-M-Y", $cutoffdate2);
 				$acc_id = $hA['profileID'];
 
 				$attachmentHTML[$key]['mime_data'] = Link::set_data($value['mimeType'], 'EGroupware\\Api\\Mail::getAttachmentAccount', array(
-					$acc_id, $mailbox, $uid, $value['partID'], $value['is_winmail'], true
+					$acc_id, $mailbox, $uid, $value['partID'], $value['is_winmail'] ?? false, true
 				));
 				$attachmentHTML[$key]['size']=Vfs::hsize($value['size']);
 				$attachmentHTML[$key]['attachment_number']=$key;
@@ -2638,7 +2638,16 @@ $filter['before']= date("d-M-Y", $cutoffdate2);
 				if (empty($attachmentHTML[$key]['mime_data']))
 				{
 					$attachmentHTML[$key]['mime_url'] = Egw::link('/index.php',$linkData);
-					unset($attachmentHTML[$key]['mime_data']);
+					// always check invoices too and then add mime_data unconditionally
+					if (Link::get_mime_info($attachmentHTML[$key]['type'], 'invoices'))
+					{
+						$attachmentHTML[$key]['mime_data'] = Link::set_data($value['mimeType'], 'EGroupware\\Api\\Mail::getAttachmentAccount',
+							[$acc_id, $mailbox, $uid, $value['partID'], $value['is_winmail'] ?? false, true], true);
+					}
+					else
+					{
+						unset($attachmentHTML[$key]['mime_data']);
+					}
 				}
 				$attachmentHTML[$key]['windowName'] = $windowName;
 
diff --git a/mail/js/app.js b/mail/js/app.js
index b9126b7bf5..a21ad76cc8 100755
--- a/mail/js/app.js
+++ b/mail/js/app.js
@@ -1264,6 +1264,16 @@ app.classes.mail = AppJS.extend(
 						sel_options.attachmentsBlock[_item.attachment_number + "[actions]"] = [collabora, ...actions];
 					}
 				}
+				// if mime-type is supported by invoices, add it at the end
+				if (egw.get_mime_info(_item.type, 'invoices'))
+				{
+					sel_options.attachmentsBlock[_item.attachment_number + "[actions]"] = [...actions, {
+						id: 'invoices',
+						label: 'invoices',
+						icon: 'invoices/navbar',
+						value: 'invoices'
+					}];
+				}
 			});
 
 			sel_options.attachmentsBlock.actions = actions;
@@ -3364,6 +3374,10 @@ app.classes.mail = AppJS.extend(
 						document.body.style.cursor = '';
 					});
 				break;
+			case 'invoices':
+			default:
+				egw.open_link(attachments[row_id].mime_data, '_blank', '', action, true, attachments[row_id].type);
+				break;
 		}
 	},