Add warning if you run the 32-bit version on 64-bit window.

Core/Config.cpp

@@ -239,6 +239,9 @@ static const ConfigSetting generalSettings[] = {
 	ConfigSetting("ShowDebuggerOnLoad", SETTING(g_Config, bShowDebuggerOnLoad), false, CfgFlag::DEFAULT),
 	ConfigSetting("ShowImDebugger", SETTING(g_Config, bShowImDebugger), false, CfgFlag::DONT_SAVE),
 	ConfigSetting("CheckForNewVersion", SETTING(g_Config, bCheckForNewVersion), true, CfgFlag::DEFAULT),
+#if PPSSPP_PLATFORM(WINDOWS) && PPSSPP_ARCH(X86)
+	ConfigSetting("Wow64WarningDismissed", SETTING(g_Config, bWow64WarningDismissed), false, CfgFlag::DEFAULT),
+#endif
 	ConfigSetting("Language", SETTING(g_Config, sLanguageIni), &DefaultLangRegion, CfgFlag::DEFAULT),
 	ConfigSetting("ForceLagSync2", SETTING(g_Config, bForceLagSync), false, CfgFlag::PER_GAME),
 	ConfigSetting("DiscordRichPresence", SETTING(g_Config, bDiscordRichPresence), false, CfgFlag::DEFAULT),

Core/Config.h

@@ -232,6 +232,7 @@ public:
 	bool bFastMemory;
 	int iCpuCore;
 	bool bCheckForNewVersion;
+	bool bWow64WarningDismissed;
 	bool bForceLagSync;
 	bool bFuncReplacements;
 	bool bHideSlowWarnings;

Core/HLE/sceUmd.h

@@ -18,6 +18,7 @@
 #pragma once
 
 #include "Common/File/Path.h"
+class PointerWrap;
 
 enum pspUmdState { 
 	PSP_UMD_INIT        = 0x00,

UI/MainScreen.cpp

@@ -21,7 +21,7 @@
 
 #include "ppsspp_config.h"
 
-#include "Common/System/Display.h"
+#include "Common/CPUDetect.h"
 #include "Common/System/System.h"
 #include "Common/UI/Root.h"
 #include "Common/UI/Context.h"
@@ -33,9 +33,6 @@
 #include "Common/StringUtils.h"
 #include "Core/System.h"
 #include "Core/Util/RecentFiles.h"
-#include "Core/Reporting.h"
-#include "Core/HLE/sceCtrl.h"
-#include "Core/ELF/PBPReader.h"
 #include "Core/ELF/ParamSFO.h"
 #include "Core/Util/GameManager.h"
 
@@ -544,6 +541,18 @@ void MainScreen::CreateViews() {
 		// Slip in at the top.
 		root_->Insert(0, upgradeBar);
 	}
+
+#if PPSSPP_PLATFORM(WINDOWS) && PPSSPP_ARCH(X86)
+	if (cpu_info.OS64bit && !g_Config.bWow64WarningDismissed) {
+		auto di = GetI18NCategory(I18NCat::DIALOG);
+		std::string_view message = di->T("You're running the 32-bit version. Use PPSSPPWindows64.exe instead for best performance.");
+		UI::LinearLayout *upgradeBar = CreateDismissableBar(message, "", [this]() {
+			g_Config.bWow64WarningDismissed = true;
+			g_Config.Save("dismisswow64");
+		});
+		root_->Insert(0, upgradeBar);
+	}
+#endif
 }
 
 bool MainScreen::key(const KeyInput &key) {