So ...

Let's see our example with a PSD file ... In order to allow PSD uploads you'll have to add the following code:

function my_myme_types($mime_types)
{$mime_types['psd'] = 'image/vnd.adobe.photoshop'; //Adding photoshop files return $mime_types;}
add_filter('upload_mimes', 'my_myme_types', 1, 1);

Basically, the function creates an array ($mime_types) and the actual file type (psd) goes as its value. In the above example, the PSD file extension represents files with the mime type image/vnd.adobe.photoshop.

And of course, you can add several file types. Here's the same function allowing the SVG and PSD extensions:

function my_myme_types($mime_types)
{$mime_types['svg'] = 'image/svg+xml'; //Adding svg extension
$mime_types['psd'] = 'image/vnd.adobe.photoshop'; //Adding photoshop files
return $mime_types;}
add_filter('upload_mimes', 'my_myme_types', 1, 1);

I simply added a new array element for the SVG file type using the image/svg+xml mime type.

You can find out the correct mime types of several common file extensions here.

And that's it ... After saving the changes (uploading the edited functions.php file) you'll be able to upload those files using the default media uploader. In my case, the PSD e-book cover:

As you can see, it's really not rocket science ...

And that's it my friends!

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Thanks for your time!