The filename given is entirely separate from the actual 'name' you can give your specification.

The Description that comes up in both the Edit|Banks option and when you have chosen to print checks (in the specification selection scrollbox) comes from the "title" given to the specification by selecting File|Specification Options when you have the spec open in Payables (or Adagio Checks) Designer.

Remember to save your specification after giving it a unique title.

Regards