g1smd - 7:11 pm on Jan 14, 2012 (gmt 0)
RewriteRule ^folder/page\.htm. - [G]
Returns 410 for requests with anything at all (in the path) after the .htm part.
RewriteRule ^folder/page\.htm/ - [G]
Returns 410 for requests with .htm and a slash and then anything or nothing (in the path) after that.
The rule must go before your redirecting rules.
Additionally, as soon as you have one rule in your htaccess file using RewriteRule do not use Redirect or RedirectMatch for any of your other rules.