diff --git a/source/PackTool/PackManagerSim.cpp b/source/PackTool/PackManagerSim.cpp
new file mode 100644
index 0000000..18224f9
--- /dev/null
+++ b/source/PackTool/PackManagerSim.cpp
@@ -0,0 +1,141 @@
+// Reproduces the exact pack-registration flow the real client performs in
+// PackInitialize() (UserInterface.cpp): parses the pack folder's "Index"
+// manifest and registers every listed pack (plus root) into one real
+// CEterPackManager, exactly like the running game does. This is the only
+// reliable way to verify a pack, because single-pack tools (PackVerify) can't
+// catch bugs in how a file's stored path lines up with what the manager's
+// merged, folder-prefixed lookup actually queries for.
+//
+// Usage:
+//   PackManagerSim.exe <packFolder> <fileNameToLookup>
+//     Looks up one file through the full manager, e.g.:
+//     PackManagerSim.exe "Y:\Metin2Dev\Exec_Client\pack" "UIScript/PopupDialog.py"
+//
+//   PackManagerSim.exe <packFolder> --verify-all <dbname>
+//     Registers all packs, then checks that every entry of <dbname> (read
+//     directly from its own .eix) resolves through the full manager, e.g.:
+//     PackManagerSim.exe "Y:\Metin2Dev\Exec_Client\pack" --verify-all uiscript
+
+#include <windows.h>
+#include <cstdio>
+#include <string>
+#include <vector>
+#include <fstream>
+
+#include "../EterPack/EterPackManager.h"
+#include "../EterBase/lzo.h"
+
+int main(int argc, char** argv)
+{
+	CLZO lzoInstance;
+
+	if (argc < 3)
+	{
+		fprintf(stderr, "Usage: %s <packFolder> <fileNameToLookup>\n", argv[0]);
+		fprintf(stderr, "   or: %s <packFolder> --verify-all <dbname>\n", argv[0]);
+		return 1;
+	}
+
+	std::string packFolder = argv[1];
+	std::string lookupName = argv[2];
+	std::string verifyDbname = (argc >= 4) ? argv[3] : "";
+
+	std::string stFolder = packFolder + "/";
+	std::string indexPath = stFolder + "Index";
+
+	std::ifstream indexFile(indexPath);
+	if (!indexFile)
+	{
+		fprintf(stderr, "Cannot open Index file: %s\n", indexPath.c_str());
+		return 2;
+	}
+
+	std::vector<std::string> lines;
+	std::string line;
+	while (std::getline(indexFile, line))
+	{
+		while (!line.empty() && (line.back() == '\r' || line.back() == '\n'))
+			line.pop_back();
+		lines.push_back(line);
+	}
+
+	if (lines.empty() || (lines[0] != "FILE" && lines[0] != "PACK"))
+	{
+		fprintf(stderr, "Invalid Index syntax\n");
+		return 3;
+	}
+
+	CEterPackManager manager;
+	manager.SetSearchMode(true); // _DISTRIBUTE build: pack-first
+
+	int registered = 0, failed = 0;
+
+	for (size_t i = 1; i + 1 < lines.size(); i += 2)
+	{
+		const std::string& rstFolder = lines[i];
+		const std::string& rstName = lines[i + 1];
+
+		std::string packName = stFolder + rstName;
+		std::string texCacheName = packName + "_texcache";
+
+		if (manager.RegisterPack(packName.c_str(), rstFolder.c_str()))
+			++registered;
+		else
+			++failed;
+
+		manager.RegisterPack(texCacheName.c_str(), rstFolder.c_str());
+	}
+
+	manager.RegisterRootPack((stFolder + "root").c_str());
+
+	printf("Registered %d packs (%d failed to open) from Index\n", registered, failed);
+
+	if (lookupName == "--verify-all")
+	{
+		if (verifyDbname.empty())
+		{
+			fprintf(stderr, "--verify-all requires a <dbname> argument\n");
+			return 12;
+		}
+
+		std::string dbname = stFolder + verifyDbname;
+		CEterFileDict rawDict;
+		CEterPack rawPack;
+		if (!rawPack.Create(rawDict, dbname.c_str(), "", true))
+		{
+			fprintf(stderr, "Cannot open raw pack '%s'\n", dbname.c_str());
+			return 20;
+		}
+
+		std::vector<std::string> names;
+		rawPack.GetNames(&names);
+
+		int ok = 0, bad = 0;
+		for (auto& n : names)
+		{
+			CMappedFile mf;
+			LPCVOID d = NULL;
+			if (manager.Get(mf, n.c_str(), &d))
+				++ok;
+			else
+			{
+				++bad;
+				printf("  MISSING VIA MANAGER: %s\n", n.c_str());
+			}
+		}
+		printf("verify-all '%s': %d/%zu OK via manager, %d missing\n", verifyDbname.c_str(), ok, names.size(), bad);
+		return bad > 0 ? 11 : 0;
+	}
+
+	CMappedFile mappedFile;
+	LPCVOID data = NULL;
+
+	bool ok = manager.Get(mappedFile, lookupName.c_str(), &data);
+
+	printf("Get(\"%s\") => %s", lookupName.c_str(), ok ? "FOUND" : "NOT FOUND");
+	if (ok)
+		printf(" (%lu bytes)", mappedFile.Size());
+	printf("\n");
+
+	return ok ? 0 : 10;
+}