app.image.200802011444.rootfs.ext2 should be on your desktop Linux (not Iliad). Let's imagine it is in your home ~/app.image.200802011444.rootfs.ext2
Let's suppose you have a folder which you'll be using as a root of the mounted file system. Again, this can be any folder, say ~/temp/
Then the command will be
mount -r -o loop ~/app.image.200802011444.rootfs.ext2 ~/temp
After mounting go inside temp and get the files to a folder on normal (= not mounted) file system. When you're done do umount ~/temp
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