From 5cbdcf2a5e84a6a750083e6de029bc2a4a1af511 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 24 Oct 2023 13:13:57 +0530
Subject: [PATCH] ...

---
 src/calibre/gui2/viewer/ui.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/viewer/ui.py b/src/calibre/gui2/viewer/ui.py
index bb6084b211..3e9c76f35a 100644
--- a/src/calibre/gui2/viewer/ui.py
+++ b/src/calibre/gui2/viewer/ui.py
@@ -748,7 +748,8 @@ class EbookViewer(MainWindow):
             exe = os.path.join(macos_edit_book_bundle_path(), exe)
         else:
             exe = exe_path(exe)
-        cmd = [exe]
+
+        cmd = [exe] if isinstance(exe, str) else list(exe)
         if selected_text:
             cmd += ['--select-text', selected_text]
         from calibre.gui2.widgets import BusyCursor