Some h5py examples create files that cannot be opened by h5dump from HDF5-1.8.12

Dear all,

Particularly two h5py examples (those are the ones I tried) from hdfgroup
website:

1. h5ex_t_float.py
<http://www.hdfgroup.org/ftp/HDF5/examples/Py/byapi/h5ex_t_float.py>
2. h5ex_t_int.py
<http://www.hdfgroup.org/ftp/HDF5/examples/Py/byapi/h5ex_t_int.py>

were run without problems by Python 2.7.8 using h5py 2.3.1 on Mac OS 10.9.4
Mavericks and Windows 7 x64 and the .h5 files were created successfully.
However, neither h5dump (from HDF5-1.8.12) on Mac nor HDFView 2.10.1 on
Windows could open the files. The errors are:

On Mac:

h5dump error: unable to open file "h5ex_t_int.h5"

on Windows:

HDFView root - C:\Program Files\HDF_Group\HDFView\2.10.1\bin
User property file - C:\Users\ekin\.hdfview2.10.1
java.io.IOException: Unsupported fileformat -
C:\Users\ekin\Desktop\EwE-F_Databases\h5ex_t_float.h5

Can you please help me with these errors? Thank you in advance.

Regards,

Ekin