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Found a solution here: Cortana not finding Desktop apps when searching for them

Here is the relevant part:

I reinstalled Cortana using the following procedure:

1. Open an elevated Command Prompt window (press win + X, and then press A)
2. Type start powershell and press enter
3. Run the command (in one line):

Get-AppXPackage -Name Microsoft.Windows.Cortana | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

After 30 seconds the problem was solved on my machine. Incredible.