The software is exactly the same on both platforms. It's all written in Javascript and PHP, with Titanium as its "shell". The only different between the Windows, Linux and Mac OS X version is the Titanium runtime, which - of course! - performs the same on all platforms.
On Windows XP you have a problem with permissions. Just right click on the folder you are trying to extract to and select Properties. First, make sure that read only is disabled (white check box). If it is selected or grayed out, uncheck it and apply the change recursively. Next, click on the Security tab. From there, assign the "Everybody" pseudo-user to have Full Control of the directory. This should be adequate.
Nicholas K. Dionysopoulos
Lead Developer and Director
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