diff --git a/include/filter_utils.h b/include/filter_utils.h
index 49a883a7d..df1970be4 100644
--- a/include/filter_utils.h
+++ b/include/filter_utils.h
@@ -74,6 +74,7 @@ DISKANN_DLLEXPORT tsl::robin_map<std::string, std::vector<uint32_t>> generate_la
  * Each data file is saved under the following format:
  *    input_data_path + "_" + label
  */
+#ifndef _WINDOWS
 template <typename T>
 inline tsl::robin_map<std::string, std::vector<uint32_t>> generate_label_specific_vector_files(
     path input_data_path, tsl::robin_map<std::string, uint32_t> labels_to_number_of_points,
@@ -181,6 +182,7 @@ inline tsl::robin_map<std::string, std::vector<uint32_t>> generate_label_specifi
     return label_id_to_orig_id;
 #endif
 }
+#endif
 
 inline std::vector<uint32_t> loadTags(const std::string &tags_file, const std::string &base_file)
 {
diff --git a/src/windows_aligned_file_reader.cpp b/src/windows_aligned_file_reader.cpp
index 9b1a024bd..3650b928a 100644
--- a/src/windows_aligned_file_reader.cpp
+++ b/src/windows_aligned_file_reader.cpp
@@ -6,6 +6,7 @@
 #include "windows_aligned_file_reader.h"
 #include <iostream>
 #include "utils.h"
+#include <stdlib.h>
 
 #define SECTOR_LEN 4096
 
@@ -43,9 +44,17 @@ void WindowsAlignedFileReader::register_thread()
         FILE_ATTRIBUTE_READONLY | FILE_FLAG_NO_BUFFERING | FILE_FLAG_OVERLAPPED | FILE_FLAG_RANDOM_ACCESS, NULL);
     if (ctx.fhandle == INVALID_HANDLE_VALUE)
     {
-        std::stringstream ss;
-        ss << m_filename.c_str();
-        diskann::cout << "Error opening " << ss.str() << " -- error=" << GetLastError() << std::endl;
+        const size_t c_max_filepath_len = 256;
+        size_t actual_len = 0;
+        char filePath[c_max_filepath_len];
+        if (wcstombs_s(&actual_len, filePath, c_max_filepath_len, m_filename.c_str(), m_filename.length()) == 0)
+        {
+            diskann::cout << "Error opening " << filePath << " -- error=" << GetLastError() << std::endl;
+        }
+        else
+        {
+            diskann::cout << "Error converting wchar to char -- error=" << GetLastError() << std::endl;
+        }
     }
 
     // create IOCompletionPort