[PHP-INST] How to set some file which are download files ?

[Perrin]

Hi,

I want to set a file that is download file ! but I don't know how to set ?

For Example: 
                           <?
                             echo "This is testing abc.abc";
                            ?>

Actually, I hope the browser open the save dialog box and save it file, but when I 
click it will executive. 
May be set some Apache Configuration. Do you know how to set some file are download 
files ?

Thank
Perrin