When opening a file with POIFSFileSystem fs = new POIFSFileSystem(fis);
if this file have a size not modulus 0x200 then an exception occured.

It's seem that old Ole Document can have this size for example : 539 990 bytes
(0x83D56).

If the file is re save with new softwar, then the size is : 603 136 bytes (0x93400)

I have done a patch in RawDataBlock
        _data = new byte[ POIFSConstants.BIG_BLOCK_SIZE ];
        int count = IOUtils.readFully(stream, _data);

        if (count == -1)
        {
            _eof = true;
        }
        else if (count != POIFSConstants.BIG_BLOCK_SIZE)
        {
            String type = " byte" + ((count == 1) ? ("")
                                                  : ("s"));
/*
            throw new IOException("Unable to read entire block; " + count
                                  + type + " read; expected "
                                  + POIFSConstants.BIG_BLOCK_SIZE + " bytes");
                                  */
                                 System.err.println("Unable to read entire
block; " + count
                                 + type + " read; expected "
                                 + POIFSConstants.BIG_BLOCK_SIZE + " bytes"
);
        }
        else
        {
            _eof = false;
        }