Zip format
----------
http://www.pkware.com/support/zip-application-note
http://www.xxcopy.com/xxcopy06.htm

Data URL
--------
https://developer.mozilla.org/en/The_data_URL_scheme
http://msdn.microsoft.com/en-us/library/cc848897(VS.85).aspx
http://www.phpied.com/mhtml-when-you-need-data-uris-in-ie7-and-under/

http://www.motobit.com/util/base64-decoder-encoder.asp

Saving files
------------
http://msdn.microsoft.com/en-us/library/ms536676(VS.85).aspx
http://msdn.microsoft.com/en-us/library/ms536419(VS.85).aspx
http://msdn.microsoft.com/en-us/library/ms537418(VS.85).aspx