htaccess directory ?

hi,

i am using my wordpress in a custom named directory like root/blog/ but everytime i add a page or update permalink structure, wordpress is updating or creating a new .htaccess file at the root/ but not at the root/blog/. Is there a way to tell wordpress my installation and .htaccess file are at the root/blog/ directory not in the root/ so i dont have to copy the updated .htacces file everytime from site root to wordpress folder.

P.S: by the way, i am using a subdomain like http://subdomain.domain.com which directs to http://www.domain.com/subdomain/

thanks_