Ever imagined buying a Windows driver? Yep first time for everything lol.
Because Microsoft is stuck up their own ancient backside, bluetooth audio was never given a passing thought so when you connect your wireless headphones, Windows will decide what codec to use, typically the most baseline either SBC or low quality aac. The Alternative A2DP driver contains all the supported codecs so you essentially force Windows to use LDAC or aptX HD or whatever the max your headphones support, can also tailor what sampling rate etc Windows gives you the option for, or again force it to use whatever you choose.
Was only $7 so not really too big a deal.
Neat.