Run MQTT Explorer with Appimage - Error Binärdatei

[line439]

Hello,

when trying to run the MQTT Explorer I got following errog:

bash: ./MQTT.AppImage: Kann die Binärdatei nicht ausführen: Fehler im Format der Programmdatei
Do you have a sulution for it? When I check the properties of my MQTT.Appimage under "Open with" it is mentioned "Geany". So i guess this is wrong. Is there any possibility to change it with the terminal and run it afterwards?

Thanks a lot
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[ilgrank]

In case you haven't noticed, the author is away from the project since years.
Just telling you in case you expected/hoped for a reply from him.