Here's an interview that Wenders did back on 2011...
http://blogs.indiewire.com/theplaylist/nyff_wim_wenders_discusses_painful_hammet_collaboration_with_coppola_friend
(check point 4 & 5)
In this interview he says he shot two versions but only 10 percent of the first version ended up in the final cut. He maintains he did shoot both. The first final cut was all location shooting and he says it was destroyed. The location shooting that was saved is easily noticeable in the released version.
http://www.indiewire.com/2015/03/wim-wenders-sets-the-record-straight-on-his-forgotten-francis-ford-coppola-produced-noir-hammett-265726/