For some reason, since recently (perhaps even today, after installing the MacOS 10.13.3 Supplemental Update), I can't launch "Time Machine.app" to enter the Time Machine file restore interface.

When I double-click the app, nothing happens. It doesn't appear in Activity Monitor, etc.

What should I try, in order to fix this?

As mentioned above, I'm running MacOS 10.13.3, so the very latest version. It's on a Mac Mini, with a Time Machine drive connected via USB, which I've been using for months and still has plenty of free space available.

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