Features
- Converting Texture2D XNB files to PNG images.
- All versions of XNA are supported: 1.0, 2.0, 3.0, 3.1, 4.0.
- Command line.
- Terraria (XNA 4.0)
- Dust: An Elysian Tail (XNA 4.0)
- Capsized (XNA 3.1)
- Blueberry Garden (XNA 3.0)
The tool converts only Texture2D files, but XNB files can contain pretty much any data. Out of the box, that's also fonts, sound banks and other stuff. I have no immediate plans to implement converting these (these objects don't have "Save" methods, so it would require much more code), but pull requests are welcome (the program is written in VS 2012, C# 5.0, .NET 4.5).
Download XnaConvert from GitHub
Documentation and sources on GitHub