Flatview on Android 4.1.1 device not working

I've probably missed something along the line, but Flatview seems to working when I connect my old phone running Android 2.3, but not on my Nexus 7 running Android 4.1.1. Any ideas?

FlatView will only work if the device mounts as a normal drive letter.

Ahh. Thanks Jon. Is there any way to force a drive letter on the device?

Not with the Nexus 7, afaik it only supports MTP (which on Windows is implemented via a namespace extension).
We hope to provide an MTP filesystem plugin at some point which would mean stuff like FlatView would work.

Thanks Jon. Appreciate your quick response. I guess I'll have to manually go through the folders.

I have question about MTP and folder format.
Is there a way to save format ?
Each time I browse folder in my SGS3, files are display in Tiles Mode (windows 7) even if I save lister as default.