410 error with htaccess for all *.html pages in Joomla?

[KelvinSmith]

You can add the following rule in htaccess:

RewriteEngine on

#--exclude "/googlea1b2c3d4e5f6.html--#
RewriteCond %{REQUEST_URI} !^/googlea1b2c3d4e5f6\.html$ [NC]
#--redirect all .html requests to 410 Gone--#
RewriteRule \.html$ - [R=410,L]

[Aiden]

Recently, I had a problem with my web server. Having a security hole at Joomla, somebody created thousands of files (ending in *.html) in my website.

I have removed all these files, but Google keep querying this particular files. I have previously added a more than hundred of pages at Google Webmaster Tools being removed, however there are still lots of files.

I just want to put a rule in the .htaccess file to return a 410 error code when any file ending with .html is requested, EXCEPT if the page is googlea1b2c3d4e5f6.html (a file from google).

How to sort out this problem?