I'm glad you tried some tools yourself, but some more information about how they failed would make it easier to diagnose your issue.
There may have been informative error messages, or maybe the output you got was garbled in some way.
In this case ww2ogg runs fine on these files, with no error message, but just running "ww2ogg 178908360.wem" produces a corrupted output file. If you'd said that, I could have just told you to run: