Delete Range Name (control Character?)

I have a defined range in my workbook which I have not been able to delete (I think it got there through some malware because I didn't create it!)

The main annoyance is that the name refers to another workbook (to which I don't have access) and to a non-existent range therein (resulting in a #REF! error) - so I get the unwanted Update Links message each time I open the workbook. I have created my own workbook with the same name as the workbook referred to by the name, hoping that I may gain some level of control over this gremlin, but to no avail.

The name is "Flow" immediately followed by a thin-lined empty square (like the ANSI character 042 formatted using Wingdings2 font). It could be a line-feed character.

Whatever it is, I have not been able to delete this range name - either directly through the Insert / Name / Define / Delete commands or by using VBA. Using the menu commands I can select the name, edit it (even add a valid cell reference to the workbook name), and click Add - but that just adds a new name "Flow" without the control character and the original name remains! The original name also remains if I select the name and click Delete.