Problem save 3D file .msh

General Discussion
1

Hello, I am trying to save a mesh3 by:

load "msh3"

mesh3 Th=cube(5,5,5);
savemesh(Th,"Th.msh");

plot(Th,wait=true);

but it give me:

Load: lg_fem lg_mesh lg_mesh3 eigenvalue
    1 : load "msh3"(load: loadLibary D:\FreeFem++\\.\msh3 = 0)
    2 :
    3 : mesh3 Th=cube(5,5,5);
    4 : savemesh(Th,"Th.msh");
    5 :
    6 : plot(Th,wait=true); sizestack + 1024 =1256  ( 232 )

  -- Cube  nv=216 nt=750 nbe=300 kind= 6
  -- Mesh3::Save  UNABLE TO OPEN  :Th.msh
  current line = 4
Exec error : PB Write error !
   -- number :1
Exec error : PB Write error !
   -- number :1
 err code 8 ,  mpirank 0

but if I use the following codes are OK!

load "msh3"

mesh3 Th=cube(5,5,5);
savemesh(Th,"Th.mesh");

plot(Th,wait=true);

Could you help me overcome this problem?

2

I understand it,
3D file.msh is for FreeFEM not for FreeFEM++