ActiveWorkbook.SaveAs FileFormat:=xlUnicodeText locked macro cannnot run

Hi All

When I use below in a VBA password locked for view in Excel VBA in 2010/2007, it cannot be run and shows "1004" error Excel cannot find any data to replace....

ActiveWorkbook.SaveAs Filename:="c:\test.txt", FileFormat:=xlUnicodeText, _
        CreateBackup:=False

But if I change it to below, it will work:

ActiveWorkbook.SaveAs Filename:="c:\test.txt", FileFormat:=xlText, _
        CreateBackup:=False

Sincerely ask for advice.

THanks.

Gary