1] Notepad. Opening an XFDL file in Notepad is a no-brainer. Right-click on the XFDL file, hover to “Open with” in the context menu, and select Notepad.

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. Skip to Main Content.

In case you missed it, Microsoft resurrected the old XML Notepad last year. The new version, XML Notepad 2007, is a .NET 2.0 application for which source code is available on CodePlex. I find it ...