Gael360 released a new GUI tool that will allows you to easily read/navigate the files/data on the Xbox 360 HD with a win32 PC. The application can't write files on the HD/Dump yet.
From gueux-forum.net (I translated it from french to english):
[QUOTE]
There are 2 ways to navigate (read) the Xbox360 HD:
* With the first button (Open File) to open a dump of the disc (faster and more secure)
* Or you can read directly from the disc (in that case the Xbox360 disc must be selected as default) by using the icon on the right (Open Disc)



This is the first version, the program will evolve in the coming days, including support for PIRS files.

Some info about the content of the disc:
* Cache: as the name says ... used for caching
* Content: sub-dir 0000... contains the demos and other things you downloaded from LIVE. The other sub-dirs are user profiles.
* mindex: contains music files (both the original music files that come with the HD and those you recorded/transfered)
* H2: unknown (something with Halo2?)
* Compatibility: Xbox 1 gamesaves
* $systemupdate: Last weeks system (kernel/dashboard) update? (seems to contain the dashboard/system files (xex files) flashed on the Xbox360 TSOP during the update)
[/QUOTE]


Gael360 also released an update of wxTheme, a tool used to extract the content of Xbox 360 theme files. From gueux-forum.net(1)/gueux-forum.net(2) (also translated to english):
[QUOTE]
The biggest difference is an improved handling of the PIRS format to allow extracting theme files located on the Xbox 360 HD.
You'll find the themes you downloaded from LIVE in this directory on your Xbox360 HD (atleast that's where they were on my console): -Content-0000000000000000-FFFFE07D1-00030000



You can also use this software to open PIRS files other than themes files, but with some bugs. I'm working on a more stable application dedicated to PIRS files.
[/QUOTE]

Official Site: http://bouclier.free.fr/

Download wxHdd v1.0: wxHdd-1.0 (requires .NET v2.0 Framework)
Download wxTheme v1.1: wxTheme-1.1 (requires .NET v2.0 Framework)

News-Source: http://www.xbox-scene.com