UPDATE: Note that Version 1.1.9 is attached about two posts down
I believe that this is where it belongs…the original post being: http://ellislab.com/forums/viewthread/31422/.
I’ve attached v. 1.1.8 (added comments over version 1.1.7) of the FCKeditor Extension. There is a readme on how the basic steps on how to install it. I also have provided supporting documentation on the Expression Engine Wiki at http://www.eewiki.com/wiki/FCKEditor
Just to note that the built in filemanager does work with expression engine, it just needs to be configured properly. I suggest reading the wiki for more information.