I run the following lines of code using python 3.9 and receive the error message "UnicodeDecodeError: 'ascii' codec can't decode byte 0x94 in position 4: ordinal not in range(128)".

# -*- coding: utf-8 -*-
import pickle

fName = 'fileName.pkl'
with open(fName, 'rb') as file:
    data = pickle.load(file)

How do I know what the correct encoding format is? What are the different encoding formats?