AddType text/html .gz failes...

[Error12]

Hello,

I use Wordpress on a hosting with Litespeed. I also use WP Super Cache with GZip. It does work on Apache, yet on Litespeed it renders garbage on IE.

I believe the problem is the content of .htaccess file:
AddEncoding x-gzip .gz
AddType text/html .gz

which I guess does not work at all.

Could you please suggest any solution?

Regards, E