If you want to try to convert your ape files without too much pain, here is a method:
1. Parallels Desktops run windows with Intel macs. You can do it with Boot camp too.
2. foobar2000 + iTunesEncode.exe. Make a big playlist with all your apes and covert to Apple Lossless.
3. A few hours later, import in your iTunes

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XLD is a great program to convert files to apple formats, but it does not support playlists.