I've gotten some additional test data on the behavior of Windows EAP supplicants with respect to NAI internationalization. If the Windows version is XP-SP2 or below the NAI is sent in ANSI. This is what Stefan was observing.
If the Windows version is XP-SP3 or Vista SP1, the NAI is encoded in UTF-8 for the WLAN EAP supplicant, but remains ANSI for the PPP EAP supplicant (includes dialup as well as VPN (PPTP/L2TP/SSTP)). This is because the WLAN EAP supplicant is a newer code base (EAPHOST), and the PPP EAP supplicant utilizes an older code base (Windows 2000 EAP supplicant). Going forward, the NAI will be sent in UTF-8 for all EAP supplicants, since all supplicants will be based on EAPHOST.
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