From your phone's browser, go to
RROYY - APPLICATIONS
About 3/4 of the way down the page (maybe closer to just past half-way down) to "Documents to Go" v. 18.104.22.168 for OS 6.
That's the beta version never officially released. Once installed, don't bother going into the app itself. It just stalls at the spinning icon and nothing happens, but you can back out if you do go in because it doesn't stall the phone.
But you can browse to your files through the file manager and now open PDFs directly. Word, Excel and PowerPoint files too. Opening such files from email attachments also opens through Docs to Go as well.