diff --git a/mail/inc/class.mail_ui.inc.php b/mail/inc/class.mail_ui.inc.php
index aff9afd69d..444a9b3bef 100644
--- a/mail/inc/class.mail_ui.inc.php
+++ b/mail/inc/class.mail_ui.inc.php
@@ -2638,8 +2638,10 @@ $filter['before']= date("d-M-Y", $cutoffdate2);
 				if (empty($attachmentHTML[$key]['mime_data']))
 				{
 					$attachmentHTML[$key]['mime_url'] = Egw::link('/index.php',$linkData);
-					// always check invoices too and then add mime_data unconditionally
-					if (Link::get_mime_info($attachmentHTML[$key]['type'], 'invoices'))
+
+					// always check invoices (or it's EPL viewer) too and then add mime_data unconditionally
+					if (Link::get_mime_info($attachmentHTML[$key]['type'],
+						!empty($GLOBALS['egw_info']['user']['apps']['invoices']) ? 'invoices' : 'stylite'))
 					{
 						$attachmentHTML[$key]['mime_data'] = Link::set_data($value['mimeType'], 'EGroupware\\Api\\Mail::getAttachmentAccount',
 							[$acc_id, $mailbox, $uid, $value['partID'], $value['is_winmail'] ?? false, true], true);
diff --git a/mail/js/app.js b/mail/js/app.js
index 337b09dded..a2dc8a052a 100755
--- a/mail/js/app.js
+++ b/mail/js/app.js
@@ -1265,14 +1265,15 @@ 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'))
+				// if mime-type is supported by invoices (or the EPL viewer), add it at the end
+				const invoices_app = this.egw.user('apps')['invoices'] ? 'invoices' : 'stylite';
+				if (egw.get_mime_info(_item.type, invoices_app))
 				{
 					sel_options.attachmentsBlock[_item.attachment_number + "[actions]"] = [...actions, {
-						id: 'invoices',
+						id: invoices_app,
 						label: 'invoices',
 						icon: 'invoices/navbar',
-						value: 'invoices'
+						value: invoices_app
 					}];
 				}
 			});