diff --git a/phira/src/lib.rs b/phira/src/lib.rs
index df7ad351..81c5b808 100644
--- a/phira/src/lib.rs
+++ b/phira/src/lib.rs
@@ -342,6 +342,16 @@ fn build_global_window_conf() -> Conf {
         medium: *include_bytes!("../icon/medium"),
         big: *include_bytes!("../icon/big"),
     });
+
+    #[cfg(target_os = "windows")]
+    {
+        conf.fullscreen = dir::root()
+            .ok()
+            .and_then(|r| std::fs::read_to_string(std::path::Path::new(&r).join("data.json")).ok())
+            .and_then(|s| serde_json::from_str::<Data>(&s).ok())
+            .is_some_and(|d| d.config.fullscreen_mode);
+    }
+
     conf
 }