i prefer to use htaccess file to make seo links in my site.
and last week, i started to make htaccess file for my subdomains.

i am using this code on my base directory of subdomain:
Options +FollowSymLinks
RewriteEngine on
RewriteRule ^folder/(.*) page.php?who=$1

i want this:
when i write: subdomain.site.com/folder/kelly
it must be opened: subdomain.site.com/page.php?who=kelly

but its not working fine with this code

there is an interesting point:
when i write the adress like this:
site.com/subdomain/folder/kelly = ok, its working with the code above
but if i write this:
subdomain.site.com/folder/kelly = its not working with the same code

do u have any idea about it? what must i do?
(my subdomanis are not fake)