Manipulating a file that is like XML

I have a file that I want to read and开发者_运维知识库 manipulate. It is XML like but is not an actual XML file. It does reference a DTD however. What part of the .Net framework can I use to do the above? Will the XML API's work some how with this file?

Based on your reply to my comments, it sounds like if all that is different from a standard XML document is the lack of a header, the tools should work perfectly fine with that data. I would give System.Xml a try, and if that doesn't work, try prepending the header.