GR:AW is coded using XML, this article will identify some XML editors that you can use to modify GRAW XML files.
XML Marker is an XML Editor that uses a synchronized table-tree-and-text display to show you both the hierarchal and the tabular nature of your XML data. Download for free here
XML Notepad offers an intuitive and simple user interface that graphically represents the tree structure of XML data. Working with the standard building blocks of XML (Elements, Attributes and Text), authors are able to create reproducible data structures that can be easily filled. Download for free here.