RewriteEngine on

#RewriteCond %{REQUEST_FILENAME} !-d (salcito)$ [NC]
RewriteCond %{REQUEST_FILENAME} !\.(js|jpe?g|gif|css|swf|ico|txt|xml)$ [NC]
RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^(.*).html$ main.php?%{QUERY_STRING}[R,L]

DirectoryIndex main.php index.html index.php