diff --git a/inference-engine/src/inference_engine/file_utils.cpp b/inference-engine/src/inference_engine/file_utils.cpp
index 24e4fb4d366..10a5c277454 100644
--- a/inference-engine/src/inference_engine/file_utils.cpp
+++ b/inference-engine/src/inference_engine/file_utils.cpp
@@ -44,25 +44,6 @@ long long FileUtils::fileSize(const char* charfilepath) {
     return in.tellg();
 }
 
-void FileUtils::readAllFile(const std::string& string_file_name, void* buffer, size_t maxSize) {
-    std::ifstream inputFile;
-
-#if defined(ENABLE_UNICODE_PATH_SUPPORT) && defined(_WIN32)
-    std::wstring file_name = InferenceEngine::details::multiByteCharToWString(string_file_name.c_str());
-#else
-    std::string file_name = string_file_name;
-#endif
-
-    inputFile.open(file_name, std::ios::binary | std::ios::in);
-    if (!inputFile.is_open()) THROW_IE_EXCEPTION << "cannot open file " << string_file_name;
-    if (!inputFile.read(reinterpret_cast<char*>(buffer), maxSize)) {
-        inputFile.close();
-        THROW_IE_EXCEPTION << "cannot read " << maxSize << " bytes from file " << string_file_name;
-    }
-
-    inputFile.close();
-}
-
 namespace InferenceEngine {
 
 namespace {
diff --git a/inference-engine/src/plugin_api/file_utils.h b/inference-engine/src/plugin_api/file_utils.h
index b99711c0df2..de8221b704f 100644
--- a/inference-engine/src/plugin_api/file_utils.h
+++ b/inference-engine/src/plugin_api/file_utils.h
@@ -121,15 +121,6 @@ inline bool fileExist(const std::basic_string<C> &fileName) {
     return fileExist(fileName.c_str());
 }
 
-/**
- * @brief CPP Interface function to read a file. In case of read error throws an exception. The function supports UNICODE path
- * @ingroup ie_dev_api_file_utils
- * @param file_name - name of the file to read
- * @param buffer - buffer to read file to
- * @param maxSize - maximum size in bytes to read
- */
-INFERENCE_ENGINE_API_CPP(void) readAllFile(const std::string &file_name, void *buffer, size_t maxSize);
-
 /**
  * @brief CPP Interface function to combint path with filename. The function supports UNICODE path
  * @ingroup ie_dev_api_file_utils
@@ -163,22 +154,6 @@ inline std::basic_string<C> fileExt(const std::basic_string<C> &filename) {
     return filename.substr(pos + 1);
 }
 
-/**
- * @brief CPP Interface function to check if given fileName belongs to shared library
- * @ingroup ie_dev_api_file_utils
- * @param fileName A file name to check
- * @return `True` if fileName is a shared library fileName
- */
-inline bool isSharedLibrary(const std::string &fileName) {
-    return 0 ==
-#ifdef _WIN32
-        _strnicmp
-#else
-        strncasecmp
-#endif
-        (fileExt(fileName).c_str(), FileTraits<char>::SharedLibraryExt().c_str(), FileTraits<char>::SharedLibraryExt().size());
-}
-
 template <typename C, typename = InferenceEngine::details::enableIfSupportedChar<C>>
 inline std::basic_string<C> makeSharedLibraryName(const std::basic_string<C> &path, const std::basic_string<C> &input) {
     std::basic_string<C> separator(1, FileTraits<C>::FileSeparator);
diff --git a/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp b/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp
index 50e990f226d..8e75c133c00 100644
--- a/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp
+++ b/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp
@@ -67,6 +67,29 @@ StatusCode CNNNetReaderImpl::ReadNetwork(const void* model, size_t size, Respons
     return OK;
 }
 
+namespace {
+
+void readAllFile(const std::string& string_file_name, void* buffer, size_t maxSize) {
+    std::ifstream inputFile;
+
+#if defined(ENABLE_UNICODE_PATH_SUPPORT) && defined(_WIN32)
+    std::wstring file_name = InferenceEngine::details::multiByteCharToWString(string_file_name.c_str());
+#else
+    std::string file_name = string_file_name;
+#endif
+
+    inputFile.open(file_name, std::ios::binary | std::ios::in);
+    if (!inputFile.is_open()) THROW_IE_EXCEPTION << "cannot open file " << string_file_name;
+    if (!inputFile.read(reinterpret_cast<char*>(buffer), maxSize)) {
+        inputFile.close();
+        THROW_IE_EXCEPTION << "cannot read " << maxSize << " bytes from file " << string_file_name;
+    }
+
+    inputFile.close();
+}
+
+}  // namespace
+
 StatusCode CNNNetReaderImpl::ReadWeights(const char* filepath, ResponseDesc* resp) noexcept {
     OV_ITT_SCOPED_TASK(itt::domains::V7Reader, "CNNNetReaderImpl::ReadWeights");
     int64_t fileSize = FileUtils::fileSize(filepath);
@@ -85,7 +108,7 @@ StatusCode CNNNetReaderImpl::ReadWeights(const char* filepath, ResponseDesc* res
     try {
         TBlob<uint8_t>::Ptr weightsPtr(new TBlob<uint8_t>(TensorDesc(Precision::U8, {ulFileSize}, Layout::C)));
         weightsPtr->allocate();
-        FileUtils::readAllFile(filepath, weightsPtr->buffer(), ulFileSize);
+        readAllFile(filepath, weightsPtr->buffer(), ulFileSize);
         return SetWeights(weightsPtr, resp);
     } catch (const InferenceEngineException& ex) {
         return DescriptionBuffer(resp) << ex.what();