If you need specific app-only features (like certain exclusive app-only deals or the Mi Home camera controls), you can use an emulator.
In Google Chrome or Microsoft Edge, click the three dots in the top right corner and select "Install Mi Store" or "Install this site as an app." This creates a desktop icon that opens the store in a clean, app-like window. mi-store-app-download-for-pc
If you are looking for a creative tool, there is a separate app called Story on the Microsoft Store used for creating slideshow videos, which is unrelated to Xiaomi.
While there is no official, standalone app designed natively for Windows or macOS, you can still access Xiaomi’s marketplace and smart home services on your computer using a few simple workarounds. How to Get the Mi Store "Experience" on PC