The smali files (if I understand correctly) are the result of decompiling dex files, and part of the output of apktool. https://github.com/JesusFreke/smali https://ibotpeaches.github.io/Apktool/ The format is plain text, and the first two lines start with ".class " and ". super" respectively. This is often followed by ".source " but not always. Christoph