Special character appearing in downstream system but not seen in HL7 message.

Hi,

We're having an issue with some messages being sent to a downstream system from Healthshare.  Part of the free text in the NTE segment is displaying with special characters on the system front-end but is not present in the HL7 message that we send to them.  We are guessing that this is a result of some of the text being copied and pasted from something like MS Word. The '?' on their system is just representing an invalid character. 

Is anyone aware of a way to prevent this occurring? We are sending the messages using the 'cp1252' encoding.

Sent from us to system

What displays on the system front end

Thanks, 

Martin