UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 6118: character maps to <undefined> code example

Example 1: UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 6148: character maps to

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

Example 2: return codecs.charmap_decode(input,self.errors,decoding_table)[0] UnicodeDecodeError: 'charmap' codec can't decode byte 0x8d in position 280: character maps to

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

Example 3: UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 340: character maps to

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