Require Microsoft to distribute competing browsers in the Microsoft store.
I can install Firefox, Chromium etc. from my distro’s package manager. I don’t open a web browser to install software. You still do that on Windows because Microsoft has a financial incentive to keep competitors out of their store, so their store sucks.
If all I’m doing is looking at your catalog, it should work in a mobile browser. That way if I - a Tarheel - find myself in the midwest, I can go “does Menards have 1/4-20 hanger bolts?”
I’ll install an app if it runs mainly on my phone, like a media player or a calculator or maybe even a file viewer. Mobile games…that ship has sunk, frankly.