Problem - Signature unmatched No hashes loaded.
The file was obviously manipulated by a human (or malware ?) and is not valid.

No ethereum client would generate a UTC file with a
within the JSON file which is not hexadecimal. Each and every character must be within the range 0123456789abcdef
, if you check other UTC files, all the ciphertext and mac will only contain those characters.

There will never be a ciphertext, mac etc which was generated by an ethereum wallet software that does contain characters other than 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f (because these are the only valid hexadecimal characters)
understood thanks