Complete BPAV folder structure with sub-folders and files on a DVD (presumably copied directly from the original disc). Exactly this same DVD was used on the Mac (and produced usable .mov files for FCP via XDCAM Transfer) as was used on the PC (which produced only the second part of the spanned clip either directly in Vegas or via ClipBrowser 2.6). Incidentally, only the second of the spanned files either played on VLC or showed up in MediaInfo on the PC, which is why I thought the file was corrupted in some way. But BOTH files worked just fine on the Mac when converted. Go figure.