UNIX for Dummies Questions & Answers

Hello,

Sorry for my english.
I have an arcade site.
mydomain.com/game.html If database has the game name is good.
mydomain.com/fd43f54.html if database has not the game name redirect to mydomain.com by 302 error code.
if database has not the game name i want a 301/404 error code and no redirect.
I attached file.php to this post. Thank you very much for help.

my htaccess file:

RewriteEngine on
RewriteRule ^([_A-Za-z0-9-]+).html file.php?f=$1 [L]
RewriteRule ^([_A-Za-z0-9-]+)/$ browse.php?c=$1 [L]
RewriteRule ^([_A-Za-z0-9-]+)/([0-9]+) browse.php?c=$1&page=$2 [L]