That would be why. An xml file is not a media file, so that’s why it gets fixed, and I’m now realizing that “oggdude” is just a name and refers to a character sheet creator it seems, it’s not a set of ogg files (ogg is a music file format, like mp3, hence the confusion)!
In your case then, don’t use the import wizard, just go straight to the assets library page on the forge, and use “upload files” and select upload from zip in there. That will upload everything from the zip, regardless of its file type.