It's an internal file format that you can't change. However, if you
create a template and store it in your XLSTART folder with the name
"Book.xlt", that template will be used instead.

You can find more in XL Help ("Create a template for workbooks or
worksheets")

In article ,
"stabilo" wrote:

What is the best way the customize the WORKBOOK template when I choose
FILe.NEW - template in my computer and I choose Workbook. Where is this
Workbook template (does not seems to be a XLT file) ?
Thanks