In[]:=
DIR=NotebookDirectory[];​​SetDirectory[DIR];
In[]:=
bin=BinaryReadList["9999.bin","Real64"];​​dims={256,181,48};​​bin=ArrayReshape[bin,dims];​​{Min[bin],Max[bin]}
Out[]=
{-0.0920461,0.728111}
In[]:=
ListContourPlot3D[bin,Contours{0},Mesh->None,BoxRatiosAutomatic]
Out[]=