Excel VBA save a xlsm file as xlsx

I have an xlsm file with a large macro in it. The macro processes the file, and prepares it for sending out via email. I'd like the last step of the macro to save the file as an xlsx, with a name specified via VBA.

When the macro gets up to this line of code:
    ActiveWorkbook.SaveAs "C:\test.xlsm", FileFormat:=51

I get an error:
This extension cannot be used with the selected file type. Change the file extension in the File name text box or select a different file type by changing the Save as Type.

Can anyone help me?
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Why aren't you using .xlsx?
    ActiveWorkbook.SaveAs Filename:= _
        "C:\test.xlsx",  FileFormat:=xlOpenXMLWorkbook, ReadOnlyRecommended:=False, CreateBackup:=False

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try this
etech0Author Commented:
Now how do I get rid of this one:?

The following features cannot be saved in a macro free workbook: VB Project....

I know - that's the whole point. Can I tell it not to warn me?
Put this before the save
Application.DisplayAlerts = false

and this after
Application.DisplayAlerts = True

Application.DisplayAlerts = false
Application.EnableEvents = False
    ActiveWorkbook.SaveAs Filename:= _
        "C:\test.xlsx",  FileFormat:=xlOpenXMLWorkbook, ReadOnlyRecommended:=False, CreateBackup:=False
Application.EnableEvents = True
Application.DisplayAlerts = True

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etech0Author Commented:
Thanks! That's a big help...
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