diff --git a/experimenter/experimenter/targeting/constants.py b/experimenter/experimenter/targeting/constants.py
index 4945d889d..ff45b5030 100644
--- a/experimenter/experimenter/targeting/constants.py
+++ b/experimenter/experimenter/targeting/constants.py
@@ -2446,6 +2446,17 @@ def __post_init__(self):
     application_choice_names=(Application.DESKTOP.name,),
 )
 
+EXISTING_USER_ONLY_WIN10 = NimbusTargetingConfig(
+    name="Existing user on Windows 10 only",
+    slug="existing_user_win10",
+    description="Users with profiles older than 28 days who are on Windows 10",
+    targeting=f"{PROFILE28DAYS} && {WIN10_NOT_WIN11.targeting}",
+    desktop_telemetry="",
+    sticky_required=True,
+    is_first_run_required=False,
+    application_choice_names=(Application.DESKTOP.name,),
+)
+
 NEW_USER_FIVE_BOOKMARKS = NimbusTargetingConfig(
     name="New user (5 bookmarks)",
     slug="new_user_5_bookmarks",