I use a .htaccess file on my site that looks like:

RewriteEngine On
RewriteCond %{HTTP_REFERER} !^http://www.mijn-domein.nl/download.php.* [NC]
RewriteRule /* http://www.mijn-domiein.nl/errordocs/403.html [R,L]

This .htaccess file protects some mainly word files in some directory. In the download.php file are links to these word files. The protection works great but when you right click on the link and choose "save target as..." you are also redirected to the 403.html file.

Is it possible to let users direct;y save these files, by right clicking or in any other way downloading it (not opening the file)?

No way.

When you do not allow your users to view the doc files, how can you make them download it.

You have to move your doc files to a downloadable section.
Or, you have to restrict access via some password protection and then allow the download.

They do have to log in (mySQL log-in system) to view the download.php file. That's why they have to come from that file (see htaccess code in earlier post). In the download.php file are links to these files.

So logged-in visitors are able to VIEW them.
But I want them to be able to download it when they right click the link.