>  ... It appears that this is a result of minor 
differences 
> between the treatment of file times, between NT/W2K and 
> W9x.'
> It would be nice, if WinHTTrack could take account of 
this 
> inconsistency.

Not very simple -- the bug is located in w98 and/or in the 
windows msvcrt library. The only call made by httrack is:
  tim.actime=tim.modtime=mktime(tm_time);
  return utime(file,&tim);

And the given mktime values are only a number of seconds.. 
the bug is probably located on lower (bogus) windowd layers.