UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in

[Anjanesh Lekshminarayanan]

Im reading a file. But there seems to be some encoding error.
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
data = f.read()
File "C:\Python30\lib\io.py", line 1724, in read
decoder.decode(self.buffer.read(), final=True))
File "C:\Python30\lib\io.py", line 1295, in decode
output = self.decoder.decode(input, final=final)
File "C:\Python30\lib\encodings\cp1252.py", line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position
10442: character maps to <undefined>

The string at position 10442 is something like this :
"query":"0 1Ȉ \u2021 0\u201a0 \u2021»Ã","

So what encoding value am I supposed to give ? I tried f =
open(filename, encoding="cp1252") but still same error. I guess
Python3 auto-detects it as cp1252