diff --git a/Core/GameEngine/Source/Common/System/ArchiveFile.cpp b/Core/GameEngine/Source/Common/System/ArchiveFile.cpp
index 1f982b65a1d..8fcf7bbb3d3 100644
--- a/Core/GameEngine/Source/Common/System/ArchiveFile.cpp
+++ b/Core/GameEngine/Source/Common/System/ArchiveFile.cpp
@@ -32,6 +32,7 @@
 #include "Common/ArchiveFileSystem.h"
 #include "Common/file.h"
 #include "Common/PerfTimer.h"
+#include "Lib/PathUtil.h"
 
 
 // checks to see if str matches searchString.  Search string is done in the
@@ -81,6 +82,14 @@ static Bool SearchStringMatches(AsciiString str, AsciiString searchString)
 	return FALSE;
 }
 
+static void appendNativePathSeparator(AsciiString &path)
+{
+	if (!path.isEmpty() && !path.endsWith("\\") && !path.endsWith("/"))
+	{
+		path.concat(getNativePathSeparator());
+	}
+}
+
 ArchiveFile::~ArchiveFile()
 {
 	if (m_file != nullptr) {
@@ -157,9 +166,9 @@ void ArchiveFile::getFileListInDirectory(const DetailedArchivedDirectoryInfo *di
 		const DetailedArchivedDirectoryInfo *tempDirInfo = &(diriter->second);
 		AsciiString tempdirname;
 		tempdirname = currentDirectory;
-		if ((!tempdirname.isEmpty()) && (!tempdirname.endsWith("\\"))) {
-			tempdirname.concat('\\');
-		}
+		// TheSuperHackers @bugfix bobtista 14/08/2026 Keep archive listings native when a caller
+		// supplies a path ending in '/', rather than appending '\\' and creating a mixed path.
+		appendNativePathSeparator(tempdirname);
 		tempdirname.concat(tempDirInfo->m_directoryName);
 		getFileListInDirectory(tempDirInfo, tempdirname, searchName, filenameList, searchSubdirectories);
 		diriter++;
@@ -170,9 +179,7 @@ void ArchiveFile::getFileListInDirectory(const DetailedArchivedDirectoryInfo *di
 		if (SearchStringMatches(fileiter->second.m_filename, searchName)) {
 			AsciiString tempfilename;
 			tempfilename = currentDirectory;
-			if ((!tempfilename.isEmpty()) && (!tempfilename.endsWith("\\"))) {
-				tempfilename.concat('\\');
-			}
+			appendNativePathSeparator(tempfilename);
 			tempfilename.concat(fileiter->second.m_filename);
 			if (filenameList.find(tempfilename) == filenameList.end()) {
 				// only insert into the list if its not already in there.
diff --git a/Core/Libraries/Include/Lib/PathUtil.h b/Core/Libraries/Include/Lib/PathUtil.h
index cf1ce769d91..eddade82485 100644
--- a/Core/Libraries/Include/Lib/PathUtil.h
+++ b/Core/Libraries/Include/Lib/PathUtil.h
@@ -23,6 +23,29 @@
 #include "BaseType.h"
 #include <string.h>
 
+inline char getNativePathSeparator()
+{
+#ifdef _WIN32
+	return '\\';
+#else
+	return '/';
+#endif
+}
+
+inline const char* getLastPathSeparator(const char* path)
+{
+	const char* forward = strrchr(path, '/');
+	const char* backward = strrchr(path, '\\');
+	return !forward ? backward : (!backward || forward > backward ? forward : backward);
+}
+
+inline const wchar_t* getLastPathSeparator(const wchar_t* path)
+{
+	const wchar_t* forward = wcsrchr(path, L'/');
+	const wchar_t* backward = wcsrchr(path, L'\\');
+	return !forward ? backward : (!backward || forward > backward ? forward : backward);
+}
+
 inline const char* getExtension(const char* path)
 {
 	const char* lastDot = strrchr(path, '.');
@@ -32,7 +55,7 @@ inline const char* getExtension(const char* path)
 		return nullptr;
 	}
 
-	const char* lastSeparator = maxPtr(strrchr(path, '/'), strrchr(path, '\\'));
+	const char* lastSeparator = getLastPathSeparator(path);
 
 	// Check if the dot is contained in the filename
 	if (lastSeparator && lastDot < lastSeparator)
@@ -52,7 +75,7 @@ inline const wchar_t* getExtension(const wchar_t* path)
 		return nullptr;
 	}
 
-	const wchar_t* lastSeparator = maxPtr(wcsrchr(path, L'/'), wcsrchr(path, L'\\'));
+	const wchar_t* lastSeparator = getLastPathSeparator(path);
 
 	// Check if the dot is contained in the filename
 	if (lastSeparator && lastDot < lastSeparator)