abstract: seems as if this never worked properly repro-steps: -1 open explorer file browser -2 enable break on first chance -3 copy bootsect.old from C:\ (ctrl+c) to desktop (ctrl+v) -> fine -4 rename bootsect.old -> bootsect2.old on desktop -> fine -5 try tocopy back bootsect2.old from desktop to C:\ via ctrl+c and noting the symptom 73170 broken - same marshall-log + same exception explorer crashes copy not performed 72495 broken - same marshall-log + same exception explorer crashes copy not performed 72494 broken - same marshall-log + same exception explorer survives copy not performed 71578 broken - same marshall-log + same exception explorer survives copy not performed 70068 broken - same marshall-log + same exception explorer survives copy not performed 66666 broken - same marshall-log + same exception explorer survives copy not performed 66050 broken - same marshall-log + same exception explorer survives copy not performed (even mirroring in step3) 65496 even more broken, I failed here even in step3: on explorer-file-browser pressing ctrl+c gave: (ntoskrnl/se/accesschk.c:253) HACK: RemainingAccess = 0x00000112 DesiredAccess = 0x0010019b on desktop pressing ctrl+v nothing happened -this was the very first explorer_new trunk-rev and is the oldest trunk revision i intend to test here -(when I tried to perform the copy via context menu and mouse instead to workaround I was able to complete the copy but desktop+filebrowser were linked in a strange way then [mirroring])