There are two form mailers on Windows shared hosting: gdform.php and webformmailer.asp. Reinstalling updates your hosting account's scripts directory with the latest version of gdform.php.
webformmailer.asp is accessed through a virtual directory and is not updated when you reinstall the scripts directory. You cannot modify webformmailer.asp.
As of October 29th, 2008, gdform.asp is no longer offered on Windows shared hosting accounts. Reinstalling default scripts will not remove or modify an existing gdform.asp.
WARNING: gdform.asp cannot be recovered if it is deleted.
gdform.php will be reinstalled. This process may take up to 15 minutes to complete.