Well Alan, I’m Mac so can’t comment on any PC tech stuff. The BPAV folders do, as you know, have to come out of your card in their entirety. I store them on a separate drive for the whole of my editing process, once a production is complete and exported I delete all my camera BPAV files, merely archiving the final ProRes file.
As to my workflow, I use, as I said, Sony Transfer (any of these similar Sony Apps will do), to convert the media to a QT.mov file. I’m not sure what happens to all the other information that’s in the BPAV, I suppose the Transfer takes care of that. So, with Transfer open and the clips from the folder visible, I select a clip, mark in and out that I want and import into my Media 100, having selected ProRes 422 HQ as my codec. On pressing import the media is rendered before import, much quicker than real time but nevertheless a bit of a pain if you’re in a hurry. Audio comes in automatically at the same time. After that, once the media is in the appropriate bins that I have prepared I close Transfer and edit in the normal way.
Others will doubtless have different workflows but this has worked for me since I’ve been shooting with the EX 1 for the last seven or eight years. Make sure that you can access and use the Transfer software though, that’s an essential link in the process.