RewriteEngine on
RewriteRule ^game/([0-9]+)/([_A-Za-z0-9-]+).html index.php?action=file&fileid=$1 [L]
RewriteRule ^category/([0-9]+)/([_A-Za-z0-9-]+)/?$ index.php?action=browse&cid=$1 [L]
RewriteRule ^category/([0-9]+)/([_A-Za-z0-9-]+)/([0-9]+).html index.php?action=browse&cid=$1&page=$3 [L]
RewriteRule ^profile/([0-9]+)/([_A-Za-z0-9-]+).html index.php?action=profile&uid=$1 [L]
RewriteRule ^([_A-Za-z0-9-]+).html index.php?action=$1 [L]