UnicodeEncodeError: 'mbcs' codec can't encode characters in position 0--1: invalid character code example

Example 1: 'charmap' codec can't decode byte 0x98 in position

file = open(filename, encoding="utf8")

Example 2: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

with open(file, newline='', encoding="utf16") as MyFile: