diff --git a/linux.py b/linux.py
index 3fa8bc8..45b6eda 100644
--- a/linux.py
+++ b/linux.py
@@ -273,7 +273,7 @@ def run_tray() -> None:
 
 
 def main() -> None:
-    if not acquire_lock("linux.py"):
+    if not acquire_lock():
         _show_info("Приложение уже запущено.", os.path.basename(sys.argv[0]))
         return
     try:
diff --git a/macos.py b/macos.py
index 78a1180..e0d7f79 100644
--- a/macos.py
+++ b/macos.py
@@ -610,7 +610,7 @@ def run_menubar() -> None:
 
 
 def main() -> None:
-    if not acquire_lock("macos.py"):
+    if not acquire_lock():
         _show_info("Приложение уже запущено.")
         return
     try:
diff --git a/utils/tray_common.py b/utils/tray_common.py
index ed559fd..7124d1f 100644
--- a/utils/tray_common.py
+++ b/utils/tray_common.py
@@ -51,7 +51,7 @@ def ensure_dirs() -> None:
 _lock_file_path: Optional[Path] = None
 
 
-def _same_process(meta: dict, proc: psutil.Process, script_hint: str) -> bool:
+def _same_process(meta: dict, proc: psutil.Process) -> bool:
     try:
         lock_ct = float(meta.get("create_time", 0.0))
         if lock_ct > 0 and abs(lock_ct - proc.create_time()) > 1.0:
@@ -63,7 +63,7 @@ def _same_process(meta: dict, proc: psutil.Process, script_hint: str) -> bool:
     return False
 
 
-def acquire_lock(script_hint: str = "") -> bool:
+def acquire_lock() -> bool:
     global _lock_file_path
     ensure_dirs()
     for f in list(APP_DIR.glob("*.lock")):
@@ -84,7 +84,7 @@ def acquire_lock(script_hint: str = "") -> bool:
             pass
         is_running = False
         try:
-            is_running = _same_process(meta, psutil.Process(pid), script_hint)
+            is_running = _same_process(meta, psutil.Process(pid))
         except Exception:
             pass
         if is_running:
diff --git a/windows.py b/windows.py
index 70a93d3..b489492 100644
--- a/windows.py
+++ b/windows.py
@@ -56,6 +56,39 @@ from ui.ctk_theme import (
 _tray_icon: Optional[object] = None
 _config: dict = {}
 _exiting = False
+_win_mutex_handle = None
+
+_ERROR_ALREADY_EXISTS = 183
+
+
+def _acquire_win_mutex() -> bool | None:
+    global _win_mutex_handle
+    try:
+        kernel32 = ctypes.windll.kernel32
+        kernel32.CreateMutexW.restype = ctypes.c_void_p
+        kernel32.CreateMutexW.argtypes = [ctypes.c_void_p, ctypes.c_bool, ctypes.c_wchar_p]
+        handle = kernel32.CreateMutexW(None, True, "Local\\TgWsProxy_SingleInstance")
+        if kernel32.GetLastError() == _ERROR_ALREADY_EXISTS:
+            kernel32.CloseHandle(ctypes.c_void_p(handle))
+            return False
+        if not handle:
+            return None
+        _win_mutex_handle = handle
+        return True
+    except Exception:
+        return None
+
+
+def _release_win_mutex() -> None:
+    global _win_mutex_handle
+    if _win_mutex_handle:
+        try:
+            kernel32 = ctypes.windll.kernel32
+            kernel32.ReleaseMutex(ctypes.c_void_p(_win_mutex_handle))
+            kernel32.CloseHandle(ctypes.c_void_p(_win_mutex_handle))
+        except Exception:
+            pass
+        _win_mutex_handle = None
 
 ICON_PATH = str(Path(__file__).parent / "icon.ico")
 
@@ -350,13 +383,20 @@ def run_tray() -> None:
 
 
 def main() -> None:
-    if not acquire_lock("windows.py"):
+    if mutex_result := _acquire_win_mutex() is False:
         _show_info("Приложение уже запущено.", os.path.basename(sys.argv[0]))
         return
+    if mutex_result is None:
+        log.warning("Named mutex unavailable, falling back to lock file")
+        if not acquire_lock():
+            _show_info("Приложение уже запущено.", os.path.basename(sys.argv[0]))
+            return
+
     try:
         run_tray()
     finally:
         release_lock()
+        _release_win_mutex()
 
 
 if __name__ == "__main__":