为什么我的开放式购物车htaccess规则不重定向

In reference to

http://stackoverflow.com/questions/7184712/why-is-my-htaccess-rule-not-rewriting-the-url

i am using the above solution and it is working fine for me but when i use to write a rule for url having ? in it it got fail

RewriteRule ^wp-content/plugins/popup/popup.css\?ver\=4.3$ /contact-us  [L,QSA]

the above rule is not working. what i am missing here ?

Ok i found the solution

RewriteCond %{QUERY_STRING} ^ver=4.3$
RewriteRule ^wp-content/plugins/popup/popup.css$ /contact-us  [L,QSA]