'utf-8' codec can't decode byte 0xa1 in position 5813: invalid start byte code example

Example 1: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

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

Example 2: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa5 in position 10: invalid start byte

#use rb over r
with open(path, 'rb') as f:
  text = f.read()