Open the document in the appropriate application and when you go to save the edited document change the document name a bit - one character is enough. Then send the edited document as an attachment via email.

The whole point of my problem is that I cannot edit it. It is in read only format.

Malcolm

You can either remove the read-only attribute via the properties (right-click the file) or copy this file to another file/folder and make this change there. Firefox normally only sets the read-only attribute when you use "open with" to open the file in another application and in this case the file is downloaded to the temp folder where it can be removed at any time.