AppImage Archive format is not recognised!

Hello, I set the Appimage to an executable file, but the AppImage won’t open by double click.
Terminal → ./file.Appimage error: bash: ./filename.AppImage: Permission denied
I check permissions with su - and password but error: su: Authentication failure

Please help

Run

chmod +x file.Appimage

to make it executable

su - asks for the root password. If you haven’t defined one yet, run

sudo -i 
passwd

You can check permission with

ls -lz file.Appimage

Thanks, tried and knew those suggestions.

Are you working on a Fedora Workstation?

The Gui for app image is “Gear Lever”.

Have a look if you get some more information with it.

Where is your app image stored?
Are you in the wheel group?