Catalina Terminal zsh exec format error

Use the following syntax:

open -a "/Applications/Utilities/Capture d'écran alias"

None of the applications in the /Applications folder, or Utilities folder have any execution privileges by design because they are package folders containing the real, internal, executable application binary. You cannot just run these graphical applications like they were Unix commands. Their aliasses created by the Finder are non-executable too.

The open command above is the right approach.

If no Terminal.app window opened in the new session, you probably have something wrong in your login scripts.

This would probably be a script called at login from your user login (System Preferences > Users & Groups > Login Items) that contains a bug. Seemingly something attempting a screenshot.

Or a lower-level script for the shell logins. Given you’re seemingly not explicitly launching Terminal.app yourself, it’s probably an app-added login script.

This is usually a login script error, but I lack a Catalina French configurations to test this case. As a test, create a new user, and log into that user, launch Terminal.app, and see if the error arises in that context. If it does, then it looks like a more general problem with Catalina, or maybe with a system-wide script. If it does not reoccur, then there’s likely something in your login scripts involved.

I would further escape the d'écran with d\'écran within the double quotes. Of course, if the original application no longer exists, the alias won't save you.