Huge problem...FP Extensions won't work with .htaccess

[TheRookie]

In my .htaccess, I need:

AddType application/x-httpd-php .php .php3 .phtml .html

RewriteEngine On
RewriteCond %{HTTP_HOST} ^ffspiral.com
RewriteRule (.*) [ffspiral.com...] [R=301,L]

However, when I installed FP Extensions, it put two .htaccess files in my public_html: .htaccess, and .htaccess.1117677486. I try adding the code I need to the files of both of them, and it works, but then the FP extensions stop working.

Now even when I change back to my old .htaccess, the changes I made to my phpbb don't work, and I have no idea how to fix it.

Any help? Any other info you need?

This is a huge problem.

[jdMorgan]

Yes, it is a huge problem [webmasterworld.com], and I'm afraid there's no consensus on a fix.

Jim