diff --git a/src/osd/windows/ledutil.cpp b/src/osd/windows/ledutil.cpp
index 1d2d72d11a5..8f2a781b427 100644
--- a/src/osd/windows/ledutil.cpp
+++ b/src/osd/windows/ledutil.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles,Paul Priest
 //============================================================
 //
-//  ledutil.c - Win32 example code that tracks changing
+//  ledutil.cpp - Win32 example code that tracks changing
 //  outputs and updates the keyboard LEDs in response
 //
 //============================================================
diff --git a/src/osd/windows/main.cpp b/src/osd/windows/main.cpp
index efe2ad68d72..6d81d824f02 100644
--- a/src/osd/windows/main.cpp
+++ b/src/osd/windows/main.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles
 //============================================================
 //
-//  main.c - Win32 main program
+//  main.cpp - Win32 main program
 //
 //============================================================
 
diff --git a/src/osd/windows/video.cpp b/src/osd/windows/video.cpp
index b6625ea62e9..889e76caa6b 100644
--- a/src/osd/windows/video.cpp
+++ b/src/osd/windows/video.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles
 //============================================================
 //
-//  video.c - Win32 video handling
+//  video.cpp - Win32 video handling
 //
 //============================================================
 
diff --git a/src/osd/windows/window.cpp b/src/osd/windows/window.cpp
index d331ec3f4d8..3066be3d6ec 100644
--- a/src/osd/windows/window.cpp
+++ b/src/osd/windows/window.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles
 //============================================================
 //
-//  window.c - Win32 window handling
+//  window.cpp - Win32 window handling
 //
 //============================================================
 
diff --git a/src/osd/windows/winmain.cpp b/src/osd/windows/winmain.cpp
index 45d790aea78..5146bfae31e 100644
--- a/src/osd/windows/winmain.cpp
+++ b/src/osd/windows/winmain.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles
 //============================================================
 //
-//  winmain.c - Win32 main program
+//  winmain.cpp - Win32 main program
 //
 //============================================================
 
diff --git a/src/osd/windows/winmenu.cpp b/src/osd/windows/winmenu.cpp
index 2fb0a548dbe..d55bd3e3a79 100644
--- a/src/osd/windows/winmenu.cpp
+++ b/src/osd/windows/winmenu.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles
 //============================================================
 //
-//  winmenu.c - Win32 OSD core dummy menu implementation
+//  winmenu.cpp - Win32 OSD core dummy menu implementation
 //
 //============================================================
 
diff --git a/src/osd/windows/winutf8.cpp b/src/osd/windows/winutf8.cpp
index a056d694b89..a860aeb55cc 100644
--- a/src/osd/windows/winutf8.cpp
+++ b/src/osd/windows/winutf8.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles
 //============================================================
 //
-//  winutf8.c - Win32 OSD core utility functions
+//  winutf8.cpp - Win32 OSD core utility functions
 //
 //============================================================
 
diff --git a/src/osd/windows/winutil.cpp b/src/osd/windows/winutil.cpp
index 3bd27a8eff8..c06b4d2eee2 100644
--- a/src/osd/windows/winutil.cpp
+++ b/src/osd/windows/winutil.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:Aaron Giles
 //============================================================
 //
-//  winutil.c - Win32 OSD core utility functions
+//  winutil.cpp - Win32 OSD core utility functions
 //
 //============================================================