WMP says unknown year even though I've set "Date" field as "YYYY" in my Wavpack apev2 tag. I've got WMPTSE v 1.4 stable release and WinXP Home with WMP 11.
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WMP11 won't allow any plug-in to modify Year tag...I've not find any workaround at the moment, so it means no Year support with WMP11 for now...
Sorry for that, if i find a way, i'll let you know.