Currency conversion

I have added AMD (Armenian Dram) currency to the list.
But conversion doesn't take place. If I change the default currency in frontend, The price changes to 0, and the AMD is removed from the list.
I searched the forum, and find that 'AMD' is not available in finance.yahoo.com api.
Which files are responsible for making conversion. I want to change them to use other conversion services.

Hi Hamlet,
You can modify function: get_conversion in file: root > components > com_osproperty > helpers > common.php
To solve the problem with your AMD currency
Thanks
Dam