The new version, XML Notepad 2007, ... Full find/replace dialog with support for regex and XPath. Good performance on large XML documents, loading a 3mb document in about one second.

I have a directory hierarchy full of hundreds of thousands of XML files and need to find if any of them conform to a given XPath. I don't care about containers with the irrelevant-id identifier ...

Windows only: If you're delving into XML programming for the first time, or want to tweak a few software files, Microsoft's XML Notepad 2007 may be th ...