diff --git a/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider_custom_ops.cc b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider_custom_ops.cc
index 5fe37a6c30e33..90e488a1eda18 100644
--- a/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider_custom_ops.cc
+++ b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider_custom_ops.cc
@@ -7,18 +7,7 @@
 #include "core/framework/provider_options.h"
 #include "nv_execution_provider_custom_ops.h"
 #include "nv_execution_provider.h"
-
-// The filename extension for a shared library is different per platform
-#ifdef _WIN32
-#define LIBRARY_PREFIX
-#define LIBRARY_EXTENSION ORT_TSTR(".dll")
-#elif defined(__APPLE__)
-#define LIBRARY_PREFIX "lib"
-#define LIBRARY_EXTENSION ".dylib"
-#else
-#define LIBRARY_PREFIX "lib"
-#define LIBRARY_EXTENSION ".so"
-#endif
+#include "nv_platform_utils.h"
 
 namespace onnxruntime {
 extern TensorrtLogger& GetTensorrtLogger(bool verbose);
@@ -76,14 +65,14 @@ common::Status CreateTensorRTCustomOpDomainList(std::vector<OrtCustomOpDomain*>&
   // This library contains GroupQueryAttention and RotaryEmbedding plugins for transformer models
   try {
     const auto& env = onnxruntime::GetDefaultEnv();
-    auto external_plugin_path = env.GetRuntimePath() +
+    auto external_plugin_path = GetEPLibraryDirectory() +
                                 PathString(LIBRARY_PREFIX ORT_TSTR("tensorrt_plugins") LIBRARY_EXTENSION);
     void* external_plugin_handle = nullptr;
     auto status = env.LoadDynamicLibrary(external_plugin_path, false, &external_plugin_handle);
     if (status.IsOK()) {
       LOGS_DEFAULT(INFO) << "[NvTensorRTRTX EP] External plugins loaded: tensorrt_plugins (GQA + RotaryEmbedding)";
     } else {
-      LOGS_DEFAULT(VERBOSE) << "[NvTensorRTRTX EP] tensorrt_plugins library not found in runtime path (optional)";
+      LOGS_DEFAULT(VERBOSE) << "[NvTensorRTRTX EP] tensorrt_plugins library not found in EP library path (optional)";
     }
   } catch (const std::exception& e) {
     LOGS_DEFAULT(VERBOSE) << "[NvTensorRTRTX EP] tensorrt_plugins library not available: " << e.what();
diff --git a/onnxruntime/core/providers/nv_tensorrt_rtx/nv_platform_utils.h b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_platform_utils.h
new file mode 100644
index 0000000000000..f3298a8449157
--- /dev/null
+++ b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_platform_utils.h
@@ -0,0 +1,67 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// Licensed under the MIT License.
+#pragma once
+
+#include <string>
+#include "core/common/path_string.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+// The filename extension for a shared library is different per platform
+#ifdef _WIN32
+#define LIBRARY_PREFIX
+#define LIBRARY_EXTENSION ORT_TSTR(".dll")
+#elif defined(__APPLE__)
+#define LIBRARY_PREFIX "lib"
+#define LIBRARY_EXTENSION ".dylib"
+#else
+#define LIBRARY_PREFIX "lib"
+#define LIBRARY_EXTENSION ".so"
+#endif
+
+namespace onnxruntime {
+inline PathString GetEPLibraryDirectory() {
+#ifdef _WIN32
+  HMODULE hModule = NULL;
+  // Get handle to the DLL executing this code
+  if (!GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
+                              GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
+                          reinterpret_cast<LPCWSTR>(GetEPLibraryDirectory),
+                          &hModule)) {
+    return PathString();
+  }
+
+  wchar_t buffer[MAX_PATH];
+  DWORD len = GetModuleFileNameW(hModule, buffer, MAX_PATH);
+  if (len == 0 || len >= MAX_PATH) {
+    return PathString();
+  }
+
+  std::wstring path(buffer);
+  size_t lastSlash = path.find_last_of(L"\\/");
+  if (lastSlash != std::wstring::npos) {
+    return PathString(path.substr(0, lastSlash + 1));
+  }
+  return PathString();
+#else
+  // Linux and other Unix-like platforms
+  Dl_info dl_info;
+
+  if (dladdr((void*)&GetEPLibraryDirectory, &dl_info) == 0 || dl_info.dli_fname == nullptr) {
+    return PathString();
+  }
+
+  std::string so_path(dl_info.dli_fname);
+  size_t last_slash = so_path.find_last_of('/');
+  if (last_slash != std::string::npos) {
+    return PathString(so_path.substr(0, last_slash + 1));
+  }
+  return PathString();
+#endif
+}
+}  // namespace onnxruntime