The inputs would be RCA but it's not clear what the output is - possibly a 1/8" stereo mini jack, in which case you could connect it to your PC speakers. Otherwise you would use an RCA socket to stereo 1/8" mini plug adapter to connect the Wii audio output to your PC sound card Line In. The one you found is probably not suitable.

Connecting a Wii U to a computer | Nintendo Support Forums May 12, 2016 Connecting Wii to PC or PC monitor (VGA/HDMI) | GBAtemp Oct 18, 2016 Connecting a Wii Remote through Bluetooth - Microsoft

Apr 30, 2011

Use Bluetooth to Connect a Wii Remote to a PC | Tom's

Use Bluetooth to Connect a Wii Remote to a PC | Tom's

How To: Connect Your Wiimote to Your Computer Via What You Are Going to Need. First, you need to find out if your computer has an internal Bluetooth … How to Connect a Wii to a Wireless Network - dummies Turn off all your network equipment (modem and router), as well as the Wii. Leave all equipment off … How to connect Nintendo Wii to LCD Monitor - YouTube Jul 06, 2010