``bfiles`` is a Mercurial extension for handling large binary files.
You can enable it like any other Mercurial extension: add

  bfiles = /path/to/

to the ``[extensions]`` section of your ``.hgrc`` or ``.hg/hgrc`` file.

See usage.txt for information on using the extension.  


If you want to hack on bfiles, design.txt contains obsolete but
easy-to-read design information.  The source code is the final word,

To run the tests, you need a Mercurial source directory for the testing
infrastructure.  The easiest way to do this is to clone hg-crew as a
sibling of hg-bfiles::

  hg clone ../hg-crew

Then you can run the bfiles tests::

  cd tests

Everything you know about running Mercurial's tests applies here.  For
example, you can test bfiles with different Mercurial versions easily::

  hg -R ../hg-crew update 1.3.1
  cd tests