The chipset in the Nintendo Wireless USB dongle is Ralink 2500, I have it and use it as main wifi card for mutliple OS' (XP, Vista, 7) I have to tweak the Linksys WUSB54G V4(Ralink 2500) drivers to make it work with the Nintendo card in said OS' as an wireless client, you lose the capability of using it as an wifi AP though. Testing Win 7 with Vista and XP Linksys drivers, I have come to find the tweaked drivers are only stable if using the XP version for the OS, Vista version causes BSODs. Can do this tweak yourself by editing the *.INF file of the driver then manually installing after detection. 1.
http://downloads.linksysbycisco.com/downloads/WUSB54Gv4_20051110,0.exe
2.Extract zip to folder
3.Nav to *:\WUSB54Gv4_20051110,0\WUSB54Gv4_20051110\Drivers\WUSB54Gv4
4.Open rt2500usb.inf
5.Copy and Paste this: %WUSB54Gv4.DeviceDesc% = WUSB54Gv4.ndi, USB\VID_0411&PID_008B
under: [Linksys]
; DisplayName Section DeviceID
; ----------- ------- --------
6.Save file and install manually by navigating to folder where the INF is and your done.
7.If this is all too confusing you can grab my pre-tweaked tested working INF file, you can just overwrite the stock one with, in attachment.
8.If Microsoft enables requiring of Signed Drivers in future this technique breaks driver signing so may not work when Win 7 goes live.
I have tried to send feedback to Ralink and maybe I should try Buffalo too, in getting this device signed in compatible drivers so it has versatility and users can gain capabilities most cards do not have(softAP for instance) but all attempts have gone unnoticed. Think of the possibilities if it were true, signed softAP not just for Nintendo products, but to share internet with your buddies on the go with full WPA2 encryption support(not lame WEP that Nintendo uses), or a glorified wifi client with software support(WPS features).
Good Luck