That's very very strange. Erm...
How large is the DMG? Is it 101.9mb? It really shouldn't be doing that even if the file is corrupt. Did you download from a torrent or direct from the server? You could try and download it again but the pkg should be recognised even if it is corrupt.
go to this page:
http://www.flip4mac.com/wmv_download.htm
Download the file, it's pretty small. Open the DMG and see if you can run the pkg. If so then there's something wrong with the FM download. Again, you could try downloading it again.