Pierre Schweitzer fixed that during 0.4.8-dev'ing. Since then I could copy fiels > RAMsize.
Since then I tried that scenario many many times for each release up to and including releases/0.4.14 and it always worked flawlessly.
Today I tried to copy my ~700MB file again with 512MB RAM spent to the VM, and it is broken again after the recent MM works.
It regressed somewhen during 0.4.15-dev'ng, I am sure about that.
It is quite slow We do run out of pages and finally we BSOD.
0.4.15-dev-2668-ga5ea259_CanNotCopyFilesLargerRAMsizeAnymore.png is where it BSOD'ed.