Prior to any download in the SCP sink protocol, the server sends a line of text consisting of an octal number encoding Unix file permissions, a decimal number encoding the file size,and the file name. Since the file size can exceed 232 bytes, and in some compilation configurations of PuTTY the host platform"s largest integer type is only 32 bits wide, PuTTY extracts the decimal file size into a temporary string variable to send to its own 64-bit decimal decoding function. Fixed In Version: putty 0.67