Windows: Where are the executables of apps installed from Store?

Pass shortcut's path to the runner (e.g. C:\Users\UserName\Desktop\AppShortcut.lnk). This worked and my problem solved. But I didn't understand where is main executable!

UWP type app no exe file like classic application. It's app package. You can read this article to understand it well.

Source: https://docs.microsoft.com/en-us/windows/uwp/packaging/packaging-uwp-apps

UWP Apps such as Xbox Companion and others downloaded from the Windows Store do have an EXE, in fact some even have two or more. There’s a run command that opens a file explorer windows showing all the apps and you can even set as desktop shortcuts but copy and pasting them.

The file path to UWP apps has the hidden attribute in Program Files, which you would need to set the ability to see such files/folders via Folder Explorer Options. Then in the root of your C you should see a translucent like folder icon labeled Program Files\WindowsApps