This small C# Winforms based GUI app should help in extracting and converting few file types from the PS2 games, Drakengard 1 and 2.
For app usage and more info on the file formats supported by this app, please refer to the Help option available on the app.
Use the minilz0.dll files included in the libraries folder along with the MiniLz0Lib.cs file, to use the minilz0 decompressor in your compiled build.