In VBA, create workbook name with ".pdf" as a default name

I'm using the following codes to create a pdf file from xlsm file, but I got this shown up in the default name window - "CNS WC KE Tool Updated 9-29-14.xlsm20141001_1026.pdf".  How can I remove ".xlsm" from the default name window?  Thanks.

strFile = Replace(Replace(ws.Name, " ", ""), ".", "_") _
            & "_" _
            & ActiveWorkbook.FullName _
            & Format(Now(), "yyyymmdd\_hhmm") _
            & ".pdf"
   
FolderName = "C:\Users\" & User_Name & "\Desktop\"
strFile = FolderName & strFile

myFile = Application.GetSaveAsFilename _
    (InitialFileName:=strFile, _
        FileFilter:="PDF Files (*.pdf), *.pdf", _
        Title:="Select Folder and FileName to save")