I've spoken with Mr. Hinsley re: this and he said if and when the Apple Version of MetaX includes this ability, the Windows one may follow closely behind. I don't think any tagger, Windows or Mac, can handle 4+ GB files yet. I could be wrong on that though, but what I do is to tag all my less than 4 GB files with MetaX and then just tag my 4 GB plus files in iTunes. I know you can't get all the information via iTunes but at least it's something until a true tagger comes out.