Traceback (most recent call last):
  File "C:\dev\opennbt\scripts\debug-region", line 47, in <module>
    n = RegionFile(arg)
  File "C:\Python27\lib\site-packages\opennbt\region.py", line 66, in __init__
    NBTFile(buff, compressed=True)
  File "C:\Python27\lib\site-packages\opennbt\nbt.py", line 372, in __init__
    read('b')
  File "C:\Python27\lib\site-packages\opennbt\nbt.py", line 363, in read
    return struct.unpack(fmt, src.read(struct.calcsize(fmt)))
  File "C:\Python27\lib\gzip.py", line 256, in read
    self._read(readsize)
  File "C:\Python27\lib\gzip.py", line 291, in _read
    self._read_gzip_header()
  File "C:\Python27\lib\gzip.py", line 185, in _read_gzip_header
    raise IOError, 'Not a gzipped file'
IOError: Not a gzipped file