diff --git a/src/calibre/utils/winreg/default_programs.py b/src/calibre/utils/winreg/default_programs.py
index 49d1d482e8..10eee0bd98 100644
--- a/src/calibre/utils/winreg/default_programs.py
+++ b/src/calibre/utils/winreg/default_programs.py
@@ -43,7 +43,7 @@ def default_programs():
 def extensions(basename):
     if basename == 'calibre.exe':
         from calibre.ebooks import BOOK_EXTENSIONS
-        return set(BOOK_EXTENSIONS)
+        return set(BOOK_EXTENSIONS) - {'rar', 'zip'}
     if basename == 'ebook-viewer.exe':
         from calibre.customize.ui import all_input_formats
         return set(all_input_formats())