diff --git a/src/resource.h b/src/resource.h
index 98498c6..ad9cb01 100644
--- a/src/resource.h
+++ b/src/resource.h
@@ -9,31 +9,37 @@
  #pragma code_page(65001) // UTF-8
 #endif // __clang__
 
-#define IDD_MAINFRAME                   100 // Main dialog
+#define IDD_MAINFRAME                100 // Main dialog
 
-#define IDI_MAINFRAME                   106 // Main .exe/window icon
-#define IDI_SMALL                       107 // Main dialog icon
-#define IDC_MAINFRAME                   108 // Main window
+#define IDI_MAINFRAME                106 // Main .exe/window icon
+#define IDI_SMALL                    107 // Main dialog icon
+#define IDC_MAINFRAME                108 // Main window
 
-#define IDS_SUCC_ACTIVATION             0
-#define IDS_WAITING_INPUT               1
-#define IDS_ID_TOO_LARGE                2
-#define IDS_INVALID_CHAR                3
-#define IDS_INVALID_CHECK               4
-#define IDS_UNKNOWN_ID                  5
-#define IDS_UNLUCKY_ID                  6
-#define IDS_TALKING_TO_SYS              7
-#define IDS_ERROR                       8
-#define IDS_INFORMATION                 9
-#define IDS_FAILED_INITIALIZE           10
-#define IDS_FAILED_CHECK                11
-#define IDS_ALREADY_ACTIVATED           12
-#define IDS_LIC_MAN_FAILED              13
-#define IDS_GETVER_ERR                  14
-#define IDS_ABOUT_TITLE                 15
+#define IDS_SUCC_ACTIVATION          0
+#define IDS_WAITING_INPUT            1
+#define IDS_ID_TOO_LARGE             2
+#define IDS_INVALID_CHAR             3
+#define IDS_INVALID_CHECK            4
+#define IDS_UNKNOWN_ID               5
+#define IDS_UNLUCKY_ID               6
+#define IDS_TALKING_TO_SYS           7
+#define IDS_ERROR                    8
+#define IDS_INFORMATION              9
+#define IDS_FAILED_INITIALIZE        10
+#define IDS_FAILED_CHECK             11
+#define IDS_ALREADY_ACTIVATED        12
+#define IDS_LIC_MAN_FAILED           13
+#define IDS_GETVER_ERR               14
+#define IDS_ABOUT_TITLE              15
+
+#ifdef APP_MANIFEST
+ #warning "APP_MANIFEST" should not already be defined
+#else
+ #define APP_MANIFEST                1
+#endif // APP_MANIFEST
 
 #ifndef IDC_STATIC
- #define IDC_STATIC                     -1
+ #define IDC_STATIC                 -1
 #endif // IDC_STATIC
 
 // Next default values for new objects
diff --git a/src/resource.rc b/src/resource.rc
index 41faa33..ec7d470 100644
--- a/src/resource.rc
+++ b/src/resource.rc
@@ -13,11 +13,11 @@
 #include "version.h"
 #endif
 #define APSTUDIO_HIDDEN_SYMBOLS
-#include "windows.h"
+#include <windows.h>
 #undef APSTUDIO_HIDDEN_SYMBOLS
-#include "winres.h"
+#include <winres.h>
 #ifdef __MINGW32__
-#include "winuser.h"
+#include <winuser.h>
 #endif
 
 /////////////////////////////////////////////////////////////////////////////
@@ -25,7 +25,7 @@
 
 #ifdef __MINGW32__
 // Embed manifest for common controls and DPI support
-1 RT_MANIFEST "xp_activate32.manifest"
+APP_MANIFEST RT_MANIFEST "xp_activate32.manifest"
 #endif
 
 #ifdef APSTUDIO_INVOKED
diff --git a/src/utils.cc b/src/utils.cc
index 46809da..9572a87 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -96,7 +96,7 @@ float concatToFloat(int major, int minor) {
   int digits = (minor == 0) ? 1 : std::to_string(minor).size();
 
   // Build the float: whole + fractional / (10^digits)
-  const float retval = major + minor / std::pow(10.0f, digits);
+  const float retval = static_cast<float>(major + minor / std::pow(10.0f, digits));
   return retval;
 }
 
diff --git a/src/version.h b/src/version.h
index 0aa08f6..ffdf019 100644
--- a/src/version.h
+++ b/src/version.h
@@ -28,8 +28,8 @@
 #ifndef VERSION_STRING
  #define VERSION_STRING _VERSION(MAJOR_VERSION, MINOR_VERSION, BUILD_VERSION)
  #define ABOUT_TITLE L"About XP_Activate32"
- #define ABOUT_COPYRIGHT L"Copyright © 2025 Alex313031"
- #define LEGAL_COPYRIGHT L"© 2025"
+ #define ABOUT_COPYRIGHT L"Copyright \251 2025 Alex313031"
+ #define LEGAL_COPYRIGHT L"\251 2025 Alex313031"
 #endif // VERSION_STRING
 
 #endif // XP_ACTIVATE32_VERSION_H_
diff --git a/src/xp_activate32.cc b/src/xp_activate32.cc
index dcf71e0..cea62f1 100644
--- a/src/xp_activate32.cc
+++ b/src/xp_activate32.cc
@@ -1061,7 +1061,7 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine
   freopen_s(&fNonExistFile, "CONOUT$", "w", stdout); // Standard error
   freopen_s(&fNonExistFile, "CONOUT$", "w", stderr); // Standard out
 #else
-  // freopen_s doesn't exist in MinGW...
+  // freopen_s equivalent doesn't exist in MinGW32...
   fNonExistFile = freopen("CONOUT$", "w", stdout); // Standard error
   fNonExistFile = freopen("CONOUT$", "w", stderr); // Standard out
 #endif // __MINGW32__
@@ -1092,7 +1092,12 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine
   std::wstring welcome_str = L"Welcome to XP_Activate32 ver. " + getVersionW();
   std::wcout << welcome_str << std::endl;
   wchar_t buffer[64];
-  swprintf_s(buffer, 64, L" (%s) ", GetOSNameW().c_str());
+#ifndef __MINGW32__
+  swprintf_s(buffer, 64, L" (%ls) ", GetOSNameW().c_str());
+#else
+  // snwprintf is MinGW32 equivalent.
+  snwprintf(buffer, 64, L" (%ls) ", GetOSNameW().c_str());
+#endif // __MINGW32__
   std::wcout << L"Windows Version: " << GetWinVersionW() << buffer << std::endl;
 
   if (WinVer == WIN_XP || WinVer == WIN_2003) {