diff --git a/lutris/util/wineregistry.py b/lutris/util/wineregistry.py
index 6cf56a4ce..67b95b605 100644
--- a/lutris/util/wineregistry.py
+++ b/lutris/util/wineregistry.py
@@ -51,7 +51,8 @@ class WindowsFileTime:
 
 class WineRegistry(object):
     def __init__(self, reg_filename=None):
-        self.arch = None
+        self.arch = 'win32'
+        self.version = 2
         self.keys = []
         self.key_map = {}
         self.prefix_path = os.path.dirname(reg_filename)