You sure can you can search by date last modified in all versions of windows XP. Or after you run a specific search (or wildcard *)you can click on the date tab to sort by last modified date.
Either of these two methods will show you what the last files were that were modified on your system.
If that wasn’t your question – please clarify.
<b>Edited by Raevin</b>
If you’re looking for the text/data that was changed…then you can use a diff program (for Windows, I’m not aware of one, but maybe WinDiff; as for Linux, I believe at least almost all distros come with “diff” now.) But, your question is rather vague.