Unicode encoding when reading from text file

Const adTypeText = 2
Const adSaveCreateOverWrite = 2

Dim inputFile, outputFile
    inputFile = "input_file.txt"
    outputFile = "output_file.txt"

Dim inputStream
    Set inputStream  = WScript.CreateObject("adodb.stream")
    With inputStream
        .Type = adTypeText
        .Charset = "unicode"
        .Open
        .LoadFromFile inputFile
    End With

Dim outputStream
    Set outputStream = WScript.CreateObject("adodb.stream")
    With outputStream
        .Type = adTypeText
        .Charset = "utf-8"
        .Open
        .WriteText inputStream.ReadText
        .SaveToFile outputFile, adSaveCreateOverWrite
    End With

    inputStream.Close
    outputStream.Close

import os
d = {}
for root, dirs, files in os.walk('path'):
    for file in files:
        print(file)
        with open(os.path.join(root,file)) as f:
            d[file]= f.read()
            f.close()
print(d)

std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t> convert;
std::wstring myunicodestr = convert.from_bytes(myutf8str);