User Agent

Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9.1b3pre) Gecko/20081212 Mozilla/5.0 (Windows; U; Windows NT 5.1; en) AppleWebKit/526.9 (KHTML, like Gecko) Version/4.0dp1 Safari/526.8

This user agent belongs to Safari. Apple Inc developed this Browser. This Browser run on WinXP and it renders web contents with WebKit on Windows Desktop.

Browser - Safari

Safari

Version4.0 @ 32 bit
DeveloperApple Inc
ParentSafari 4.0
Device TypeDesktop

Act as 

Crawler No
Fake No
Anonymized No

Device - Apple

BrandApple
ModelMac
Platform windows 5.1 (32 bit) by Microsoft Corporation
Mobile No
Tablet No

Capabilities

Rendering EngineWebKit by Apple Inc (For Google Chrome, iOS (including both mobile Safari, WebViews within third-party apps, and web clips), Safari, Arora, Midori, OmniWeb, Shiira, iCab since version 4, Web, SRWare Iron, Rekonq, and in Maxthon 3.)
Pointingmouse
Javascript Yes
CSS Yes Version: 3
Cookies Yes
Tables Yes
Frames Yes
IFrames Yes
Background Sounds No
Java Applets Yes
VB Script No
Activex No