I'm not sure exactly what you mean, but there's:
I mean: It seems you need the file manager to open the file just to
register it as handler; is there an alternative not using the file manager?
not that I know. But you can register it "by hand" by creating a .dsktop
file yourself (as I explained earlier). Put these lines
[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
NoDisplay=true
Exec=/home/user/.local/bin/send-to-vm.sh %f
Name=Send a screenshot to VM
Comment=Custom definition for send-to-vm.sh
in a new file in ~/.local/share/applications/userapp-screenshot.desktop
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