Excel & SAS Question - DDE to save an Excel file thru SAS w/o it making a backup file?

I asked this in the SAS Discussion Forums, but no replies. I am hoping that someone here can help me solve this problem.

I am using SAS 9.2 and Excel 2007.

I have a SAS program that works well. It uses PROC EXPORT to create an Excel file. Then calls Excel to open and I have a workbook that has some macros that format the sheet. This all works well. At this point I have SAS running. Excel is open with the workbook that I have Exported and the workbook that contains the macros. The macros run and I can see that the workbook that was exported is being updated correctly. What happens then is I save this exported Excel workbook that has been updated to the original name that I used in the PROC EXPORT. I am using DDE commands.

/***************************************************/
/* Export the new file to Excel 2007 */
/***************************************************/
PROC EXPORT data = lhost.chdaily2
( keep = Category Cumulative d: )
outfile = "&mydir.\chdaily.xlsx"
DBMS = EXCEL REPLACE;
SHEET="Sheet1";
run;

.....
The above works fine.

data _null_;
file cmdexcel;
put &macrfile; *open the file containing the macro;
put &chekfile; *open the daily checkin file;
put '[RUN("chdaily_test_.xlsm!Macro_Daily_Checkin")]';
*run the macro;
run;

....
This works fine.


/* Save the changes made */
%let excelout = &mydir.\chdaily.xlsx;
data _null_;
file cmdexcel;
put '[error(false)]';
put "[save.as(%bquote("&excelout",51))]";
run;

At this point it for some reason it makes a backup file in the directory that it is sitting.

Can anyone tell me why? And if I can stop it from doing the backup.
Also, the line above that says - put '[error(false)]' - how would I write this for the excel vba - Application.DisplayAlerts = false - ?

Thanks, Nancy