Macro Assignment Lost When File Name Is Changed

When I use customize and assign a macro (to a button) I set the "Marco In" option to "This Workbook" then select a macro from the available list. If you close the Assign Macro dialog and open it again, notice how it appends the name of the file to the macro name. Later, in an automated process the xls filename is appended with a value and I think this is causing the problem because the appended data is static and thus no longer is in sync with the new (latest) filename. How do I assign macro's to either custom toolbar's or autoshapes so that the assignment is tolerant of file name changes? I tried to delete the appended data but it is appended automatically.

I am also curious why some of the macro's listed in the dialog include a filename and macro name delimited with an exclaimation mark and some are macro name only (with no delimiter).