downloading the Arabicstandard.keylout for Mac OS

Greetings to everybody,

I was trying to download the file suggested for changing the keyslayout from Mac to the Standardized Arabic in Windows. Everytime I click the right click (click+ctrl) it asks me to download the file, but download it as Arabicstandard.keylayout.txt.
Once I move it to the keyboard layout folder of my Library, I cannot change it to only Arabicstandard.keylayout
I force it by changing the name and thus, it won't show up in the list of input menu when I go to select it. How to get the file as an extention of keylayout and not .txt? Did I miss anything? thank you

E-mail: wael_qassim@yahoo.com