BB Torch :: Unwanted Files Not Visible Via Desktop?

I received my Torch due to my work, an evaluation unit given away by RIM in my region (finally a freebie after 11 years of covering the telecom sector!). I notice that the Documents to Go section has 100s of pdfs - about service level agreements and warranties in various countries. Some are as big as 5MB, so I want to delete them. (I'm guessing there are 200 - it takes 21 swipes of my finger to scroll down to the bottom of the list)

Trouble is.. when I connect to BBerry Desktop I can't find these files anywhere! Documents to Go shows up as empty.

On the device, when I click on Docs to Go this opens up as 'all files', with a folder icon saying Browse, and all these pdfs listed below that. 'Browse' leads to the folder groupings for camera, audiobooks, docs, music, etc. and the pdfs do not appear to be inside any of those.

So my only option is to delete each pdf one by one? On the handset is there some way to 'select' bunches of them and delete all at a time? I thought maybe I could do this using Windows Explorer, but whenever I click on the Flash Drive icon that represents the Torch memory I can't get in to see what's there (it says something like 'insert the disk you wish to view with this drive')