When you try to download something you get asked to Save it or Open it.
To disable this, you can use the following code in your .htaccess file:
AddType application/octet-stream .avi
AddType application/octet-stream .mpg
AddType application/octet-stream .mp3
AddType application/octet-stream .mov
AddType application/octet-stream .pdf
AddType application/octet-stream .xls
AddType application/octet-stream .zip
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