I believe, but could be mistaken, that it is stored in the IIS log. You can find the path to your IIS log by opening the IIS management interface, going to yoru website / website properties, go to the "Website" tab, and then at the bottom of the screen click the "Properties" button next to the format expansion active log down. At the bottom of the Advanced Logging Settings window, you will see the path to the log file, as well as the folder name and naming convention used for log files.
Mine is located in the C: \ WINDOWS \ System32 \ LogFiles \ folder in the W3SVC1 folder, but on XP it may be different on a Windows server.
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