I want to know how to extract an appimage file?
For type 2 AppImages, run the AppImage with --appimage-extract. For older type 1 AppImages, loop-mount the AppImage and copy out the contents.
Extract named files:
AppImage: --appimage-extract <non-existant-file> returns 0 #866
Discussion on this continues at https://github.com/AppImage/AppImageKit/issues/866. Thanks for reporting.