The game content can actually be extracted using a software called IPF Extractor.
For example, to extract the background music files, open bgm.ipf in Granado Espada\ge folder with IPF Extractor. Select the desired mp3 files and click Extract Selected button. So, who needs the CDs in the Limited Edition box set anyway? 😛
You can download IPF Extractor from Hongfire Forum.
This software can also be used to extract other game materials, such as .jpg, .dds, and .wav files.
This IPF Extractor actually requires certain Microsoft Visual C++ dependencies. If your system does not have them, you may encounter an error.
The package below includes the IPF Extractor and the requires files, specifically msvcp71.dll and msvcr71.dll.