iPhone-Dev Team have released a minor update to a popular jailbreaking tool Redsn0w to version 0.9.10b8b.
The latest version of Redsn0w makes the .zip files more compatible with the native Windows Explorer according to iPhone- Dev Team.
Update #3b: The 0.9.10b8b update to redsn0w makes the zip files more compatible with the native Windows explorer (which doesn’t like leading slashes in the filenames).
The latest Redsn0w update is also being pushed for Mac OS X with some minor bugs fixes.

Earlier, iPhone-Dev Team had released RedSn0w 0.9.10b8 to backup iPhone unlock activation ticket.
Download RedSn0w 0.9.10b8b for Windows and Mac OS X
RedSn0w 0.9.10b8b for Mac OS X