diff --git a/Core/Config.cpp b/Core/Config.cpp
index e2fd65cd88..d803a14c5a 100644
--- a/Core/Config.cpp
+++ b/Core/Config.cpp
@@ -653,6 +653,7 @@ static ConfigSetting graphicsSettings[] = {
 	ReportedConfigSetting("TrueColor", &g_Config.bTrueColor, true, true, true),
 	ReportedConfigSetting("ReplaceTextures", &g_Config.bReplaceTextures, true, true, true),
 	ReportedConfigSetting("SaveNewTextures", &g_Config.bSaveNewTextures, false, true, true),
+	ReportedConfigSetting("IgnoreTextureFilenames", &g_Config.bIgnoreTextureFilenames, true, true, false),
 
 	ReportedConfigSetting("TexScalingLevel", &g_Config.iTexScalingLevel, 1, true, true),
 	ReportedConfigSetting("TexScalingType", &g_Config.iTexScalingType, 0, true, true),
diff --git a/Core/Config.h b/Core/Config.h
index 24e7d98664..715800c79a 100644
--- a/Core/Config.h
+++ b/Core/Config.h
@@ -168,6 +168,7 @@ public:
 	bool bTrueColor;
 	bool bReplaceTextures;
 	bool bSaveNewTextures;
+	bool bIgnoreTextureFilenames;
 	int iTexScalingLevel; // 0 = auto, 1 = off, 2 = 2x, ..., 5 = 5x
 	int iTexScalingType; // 0 = xBRZ, 1 = Hybrid
 	bool bTexDeposterize;
diff --git a/Core/TextureReplacer.cpp b/Core/TextureReplacer.cpp
index c38eb58baa..1be43ebba2 100644
--- a/Core/TextureReplacer.cpp
+++ b/Core/TextureReplacer.cpp
@@ -22,11 +22,13 @@
 #endif
 
 #include <algorithm>
+#include "i18n/i18n.h"
 #include "ext/xxhash.h"
 #include "file/ini_file.h"
 #include "Common/ColorConv.h"
 #include "Common/FileUtil.h"
 #include "Core/Config.h"
+#include "Core/Host.h"
 #include "Core/System.h"
 #include "Core/TextureReplacer.h"
 #include "Core/ELF/ParamSFO.h"
@@ -112,19 +114,35 @@ bool TextureReplacer::LoadIni() {
 			ERROR_LOG(G3D, "Unsupported texture replacement version %d, trying anyway", version);
 		}
 
+		bool filenameWarning = false;
 		if (ini.HasSection("hashes")) {
 			auto hashes = ini.GetOrCreateSection("hashes")->ToMap();
 			// Format: hashname = filename.png
+			bool checkFilenames = g_Config.bSaveNewTextures && g_Config.bIgnoreTextureFilenames;
 			for (const auto &item : hashes) {
 				ReplacementAliasKey key(0, 0, 0);
 				if (sscanf(item.first.c_str(), "%16llx%8x_%d", &key.cachekey, &key.hash, &key.level) >= 1) {
 					aliases_[key] = item.second;
+					if (checkFilenames) {
+#if PPSSPP_PLATFORM(WINDOWS)
+						// Uppercase probably means the filenames don't match.
+						// Avoiding an actual check of the filenames to avoid performance impact.
+						filenameWarning = filenameWarning || item.second.find_first_of("\\ABCDEFGHIJKLMNOPQRSTUVWXYZ") != std::string::npos;
+#else
+						filenameWarning = filenameWarning || item.second.find_first_of("\\:<>|?*") != std::string::npos;
+#endif
+					}
 				} else {
 					ERROR_LOG(G3D, "Unsupported syntax under [hashes]: %s", item.first.c_str());
 				}
 			}
 		}
 
+		if (filenameWarning) {
+			I18NCategory *err = GetI18NCategory("Error");
+			host->NotifyUserMessage(err->T("textures.ini filenames may not be cross-platform"), 6.0f);
+		}
+
 		if (ini.HasSection("hashranges")) {
 			auto hashranges = ini.GetOrCreateSection("hashranges")->ToMap();
 			// Format: addr,w,h = newW,newH