I have following problem.
I`m reading Image column from SQLserver db instance. pymssql library is used for querying.
In binary variable you can find hexadecimal string:

I can save files in pdf, docx, pptx, png formats, but xlsx files are corrupted:

They have wrong size and cannot be opened. Files saved by script have prefix TMP_

from os.path import isfile, join, exists, getsize
from DealsSQL import DealsSQL
squel = DealsSQL()
files = squel.getAttachmentToUpload()

for file in files:
    binary = file['Att_Binary']
    file_name = file['Att_FullName']
    deal_id = file['Att_DealCRMID']
    att_id = file['Att_ID']
    tmp_filename = join('TEMP_FILES', 'TMP_' + file_name)

    with open(tmp_filename, "wb") as f:
        f.write(binary)
    f.close()
    print(getsize(tmp_filename))