Please help, i'm about to go insane with this problem.

I have a file management website, with upload capabilities, if the client wants to they can also download their files back if they need to, however when I click on the file it is meant to download but instead opens up to try and preview, now I have seen this on a couple sites and then you have to right click on the file and save target as, but how could I make it that even if the file clicked on is a PDF it does not try to preview, it just downloads.

I have seen most googled answers pointing towards mime types, but how do I fix that, in the php code on my page or in my server configuration or php.ini file. If so please try give as much detail as possible.

Thanks to all.

I'd suggest the server configuration, unless you have multiple sites on there. If you want to change this on a per site basis use .htaccess of course.

AddType application/x-generic-unknown pdf

That should do the trick.

Thanks that worked like a charm, I greatly appreciate it.