Try to change all back slashes to forward slashes.

Core/Config.cpp

@@ -1268,9 +1268,12 @@ void Config::AddRecent(const std::string &file) {
 
 	// We'll add it back below.  This makes sure it's at the front, and only once.
 	RemoveRecent(file);
-
 	const std::string filename = File::ResolvePath(file);
-	recentIsos.insert(recentIsos.begin(), filename);
+	std::string filename2 = filename;
+#ifdef _WIN32
+	filename2 = ReplaceAll(filename, "\\", "/");
+#endif
+	recentIsos.insert(recentIsos.begin(), filename2);
 	if ((int)recentIsos.size() > iMaxRecent)
 		recentIsos.resize(iMaxRecent);
 }

Core/PSPLoaders.cpp

@@ -321,7 +321,7 @@ bool Load_PSP_ELF_PBP(FileLoader *fileLoader, std::string *error_string) {
 
 #ifdef _WIN32
 	// Turn the slashes back to the Windows way.
-	path = ReplaceAll(path, "/", "\\");
+	//path = ReplaceAll(path, "/", "\\");
 #endif
 
 	if (!PSP_CoreParameter().mountRoot.empty()) {

UI/MainScreen.cpp

@@ -76,9 +76,9 @@ static bool IsTempPath(const std::string &str) {
 
 	const auto testPath = [&](std::string temp) {
 #ifdef _WIN32
-		temp = ReplaceAll(temp, "/", "\\");
-		if (!temp.empty() && temp[temp.size() - 1] != '\\')
-			temp += "\\";
+		temp = ReplaceAll(temp, "\\", "/");
+		if (!temp.empty() && temp[temp.size() - 1] != '/')
+			temp += "/";
 #else
 		if (!temp.empty() && temp[temp.size() - 1] != '/')
 			temp += "/";
@@ -94,7 +94,7 @@ static bool IsTempPath(const std::string &str) {
 
 #ifdef _WIN32
 	// Normalize slashes.
-	item = ReplaceAll(str, "/", "\\");
+	item = ReplaceAll(str, "\\", "/");
 
 	wchar_t tempPath[MAX_PATH];
 	GetTempPath(MAX_PATH, tempPath);