The file type relates to the sound effects used in game titles. How do you play these files? - Is there an app in the SDK which can play this file type? - Is it a container type like file extension? If so, which app will extract/add its data? Update: I have tried the MS Cross plat.... app, but I can't import the wxbs. It only allows to import wxps.
Currently there isn't any tool, either within the SDK or created by a homebrewer, that will extract xbox 360 XWB files.
As to homebrew, ............ I managed to extract them with an application called unxwb.exe. They are apperently ADP format files with the extension .wav. Sofar, I haven't found a player which can actually play them. Nor an app, which can inject them back into the xwb file.
In Xbox 1 sounds were in Xbox ACPDM Codec encrypted .wav files.. Pretty sure its the same here by speculation.