That should be solved due to
http://talk.maemo.org/showthread.php?t=86662

using Ext2fsd v0.51 or even better to Windows8 (perhaps?)
Paragon_ExtFS_for_Windows_2.41.exe

My concern is if in future be able to use Nemo, Sailfish and maybe even NITDroid, Firefox if call and camera issues should be solved. Then if not ext2,3,4 can be used both the 16GB and the 64GB version could bee too small, I think (same rootfs 4GB)?

Right now have 16GB but possible to buy a 64GB rather cheap, but without use of ext it doesn't matter - don't need all that MyDocs space for music and pictures etc!