It also reminds me of an AS 3.0 framework that I started to write a while ago which provides all kinds of file reading and writing means. It can read and write compressed and uncompressed XML-, text- and binary files. The file writing is currently only done by use of mdm Zinc but support for other data storing methods like for example LSOs are planned and I can imagine that this could be extended with native file writing once Apollo is live. Also the compression it uses is based on AS3’s own ByteArray GZip compression but it writes it’s own custom header tag to the files to identify the file type, compression, original file suffix etc. Eventually I also started to add encryption classes so the compressed data can be encrypted before.
However this started as an offspring from my current game development project where I want to use it to keep external data files compact and it is still in beta. Now that I found FZip I’m thinking about adding support for it as well so the publish date for this is delayed a bit more.