CKEditor

Check install.txt file attached to CKFinder.

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FCKeditor Integrations
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CKFinder comes with built it APIs to easily integrate it with FCKeditor. Check
the "_samples" folder for specific examples of it.

To instead configure FCKeditor manually to use CKFinder, just edit the
fckconfig.js file in the FCKeditor directory and modify the following settings:

FCKConfig.LinkBrowserURL = '/ckfinder/ckfinder.html' ;
FCKConfig.ImageBrowserURL = '/ckfinder/ckfinder.html?type=Images' ;
FCKConfig.FlashBrowserURL = '/ckfinder/ckfinder.html?type=Flash' ;

Just change "/ckfinder/" in the above URLs if you have CKFinder installed in a
different place.

The dialog box that you mention looks just like the image/link properties, they aren't the file browser, and so they aren't affected by any change to those values.

Have you enabled the file browser for those dialogs?

FCKConfig.ImageBrowser = true ;
etc...

Hi Edward,

I just missed that small word called "wiki" in your question
MediaWiki extension uses it's own dialog boxes for links and images. We have removed the file browser functionality from FCKeditor because we thought that it would be better to stay with the default way of handling uploads in MediaWiki (when you upload a file via MediaWiki, it saves some additional data to the database, perform additional file checks etc.).