CID Image

[Den]

I have received a cid image attachment that I require to open but the bloke who sent it has logged off for the weekend. Any thoughts on opening it within Windows 10.

[nowster]

Are they mug shots? 

Google is your friend: https://answers.microsoft.com/en-us/windows/forum/windows_7-ecoms/how-to-open-email-attachments-with-cid-prefixes/c1c1094a-d286-4c58-8a84-94b8d9876dae

[Den]

I've tried that and could not find a program to open the file.

[zappaDPJ]

If it's a CID prefix it's probably an in-line image that may have been marked as spam or it simply won't display in your current client. If it is a suppressed image your client should have an option to display it.  However there are a number of clients that just can't cope with this type of in-line image including Gmail, Hotmail and Yahoo! Mail.