Apache url Rewrite

[torrent]

Hi there. I would just like to know if anyone can spot any problems in my .htaccess file before I use it everywhere on the site. This is in the same folder as the url.
http://www.plentyoftorrents.com/flsh/
Also how would I go about adding other urls to this like http://www.plentyoftorrents.com/flsh/sitemap.html

If the filename is .htm and not .html could that cause any problems?
.htaccess:


RewriteEngine on
RewriteBase /
#
## Internally rewrite extensionless /flsh URLs to existing .html files
# If no filetype extension on requested URL
RewriteCond %{REQUEST_URI} !\.[a-z0-9]+$
# If URL plus extension exists as a file
RewriteCond %{REQUEST_FILENAME}.html -f
# Internally rewrite to file with extension
RewriteRule ^flsh/(.*)$ /flsh/$1.html [L]
#
## Externally redirect old .html-extension /info URLs to new extensionless URLs
# If direct client request for .html files
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /[^.]+\.html\ HTTP/
# Externally redirect to URL without extension
RewriteRule ^info/([^.]+)\.html$ http://www.plentyoftorrents.com/flsh/$1 [R=301,L]

Thanks in advance.