OSError: Unable to open file (File signature not found)

I think this is the same bug as #142.

I am trying to load a MATLAB generated data file into Jupyter using h5py. The file definitely exists. Is this also an older HDF4 format? How can I tell?

import numpy as np, h5py 
import os.path

filename1 = r"input\train_1\1_1_0.mat"

if os.path.isfile(filename1) and os.access(filename1, os.R_OK):
    f = h5py.File(filename1,'r') 
else:
    print("Either file is missing or is not readable")

And the error:

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-21-dc964679d992> in <module>()
      5 
      6 if os.path.isfile(filename1) and os.access(filename1, os.R_OK):
----> 7     f = h5py.File(filename1,'r')
      8 else:
      9     print("Either file is missing or is not readable")

C:\Users\reina\Anaconda3\lib\site-packages\h5py\_hl\files.py in __init__(self, name, mode, driver, libver, userblock_size, swmr, **kwds)
    270 
    271                 fapl = make_fapl(driver, libver, **kwds)
--> 272                 fid = make_fid(name, mode, userblock_size, fapl, swmr=swmr)
    273 
    274                 if swmr_support:

C:\Users\reina\Anaconda3\lib\site-packages\h5py\_hl\files.py in make_fid(name, mode, userblock_size, fapl, fcpl, swmr)
     90         if swmr and swmr_support:
     91             flags |= h5f.ACC_SWMR_READ
---> 92         fid = h5f.open(name, flags, fapl=fapl)
     93     elif mode == 'r+':
     94         fid = h5f.open(name, h5f.ACC_RDWR, fapl=fapl)

h5py\_objects.pyx in h5py._objects.with_phil.wrapper (C:\aroot\work\h5py\_objects.c:2579)()

h5py\_objects.pyx in h5py._objects.with_phil.wrapper (C:\aroot\work\h5py\_objects.c:2538)()

h5py\h5f.pyx in h5py.h5f.open (C:\aroot\work\h5py\h5f.c:1813)()

OSError: Unable to open file (File signature not found)

Thanks.