diff --git a/Source/Windows/WOW64/BTInterface.h b/Source/Windows/WOW64/BTInterface.h
index afa242b89..7ff7f019f 100644
--- a/Source/Windows/WOW64/BTInterface.h
+++ b/Source/Windows/WOW64/BTInterface.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <windef.h>
diff --git a/Source/Windows/WOW64/IntervalList.h b/Source/Windows/WOW64/IntervalList.h
index 6bdca9f3e..6c2b772a4 100644
--- a/Source/Windows/WOW64/IntervalList.h
+++ b/Source/Windows/WOW64/IntervalList.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <utility>
diff --git a/Source/Windows/WOW64/Module.cpp b/Source/Windows/WOW64/Module.cpp
index d88175a8e..ee5dff680 100644
--- a/Source/Windows/WOW64/Module.cpp
+++ b/Source/Windows/WOW64/Module.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
 $info$
 tags: Bin|WOW64
diff --git a/Source/Windows/include/wine/debug.h b/Source/Windows/include/wine/debug.h
index c3bc48055..70a4868e0 100644
--- a/Source/Windows/include/wine/debug.h
+++ b/Source/Windows/include/wine/debug.h
@@ -1,22 +1,5 @@
-/*
- * Wine debugging interface
- *
- * Copyright 1999 Patrik Stridvall
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
- */
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-FileCopyrightText: Copyright 1999 Patrik Stridvall
 
 #pragma once
 
diff --git a/Source/Windows/include/wine/unixlib.h b/Source/Windows/include/wine/unixlib.h
index 40d348081..bca7ae3a8 100644
--- a/Source/Windows/include/wine/unixlib.h
+++ b/Source/Windows/include/wine/unixlib.h
@@ -1,22 +1,5 @@
-/*
- * Definitions for Unix libraries
- *
- * Copyright (C) 2021 Alexandre Julliard
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
- */
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-FileCopyrightText: Copyright (C) 2021 Alexandre Julliard
 
 #pragma once
 
diff --git a/Source/Windows/include/winternl.h b/Source/Windows/include/winternl.h
index 9cd5d2260..dddcc6963 100644
--- a/Source/Windows/include/winternl.h
+++ b/Source/Windows/include/winternl.h
@@ -1,22 +1,5 @@
-/*
- * Internal NT APIs and data structures
- *
- * Copyright (C) the Wine project
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
- */
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// SPDX-FileCopyrightText: Copyright (C) the Wine project
 
 #pragma once