use macro _WIN32

gframe/deck_manager.cpp

@@ -269,7 +269,7 @@ FILE* DeckManager::OpenDeckFile(const wchar_t* file, const char* mode) {
 	return fp;
 }
 IReadFile* DeckManager::OpenDeckReader(const wchar_t* file) {
-#ifdef WIN32
+#ifdef _WIN32
 	IReadFile* reader = dataManager.FileSystem->createAndOpenFile(file);
 #else
 	char file2[256];
@@ -333,7 +333,7 @@ bool DeckManager::SaveDeck(Deck& deck, const wchar_t* file) {
 	return true;
 }
 bool DeckManager::DeleteDeck(const wchar_t* file) {
-#ifdef WIN32
+#ifdef _WIN32
 	BOOL result = DeleteFileW(file);
 	return !!result;
 #else

gframe/game.cpp

@@ -51,8 +51,8 @@ void DuelInfo::Clear() {
 }
 
 bool IsExtension(const wchar_t* filename, const wchar_t* extension) {
-	int flen = std::wcslen(filename);
-	int elen = std::wcslen(extension);
+	auto flen = std::wcslen(filename);
+	auto elen = std::wcslen(extension);
 	if (!elen || flen < elen)
 		return false;
 	return !mywcsncasecmp(filename + (flen - elen), extension, elen);

gframe/gframe.cpp

@@ -129,7 +129,7 @@ int main(int argc, char* argv[]) {
 				if(i < wargc) {
 					open_file = true;
 					if(deckCategorySpecified) {
-#ifdef WIN32
+#ifdef _WIN32
 						myswprintf(open_file_name, L"%ls\\%ls", ygo::mainGame->gameConf.lastcategory, wargv[i]);
 #else
 						myswprintf(open_file_name, L"%ls/%ls", ygo::mainGame->gameConf.lastcategory, wargv[i]);

gframe/menu_handler.cpp

@@ -428,7 +428,7 @@ bool MenuHandler::OnEvent(const irr::SEvent& event) {
 			case BUTTON_DECK_EDIT: {
 				mainGame->RefreshCategoryDeck(mainGame->cbDBCategory, mainGame->cbDBDecks);
 				if(open_file && deckManager.LoadCurrentDeck(open_file_name)) {
-#ifdef WIN32
+#ifdef _WIN32
 					wchar_t *dash = wcsrchr(open_file_name, L'\\');
 #else
 					wchar_t *dash = wcsrchr(open_file_name, L'/');