.SMALI File Extension

Developer file written in Smali, the assembly language used by the Android Dalvik Virtual Machine; usually created by decompiling .DEX (Dalvik Executable) files, which are the executables included in Android apps (.APK files); usually used for low-level inspection of an Android app's contents, or for hacking Android apps.

You can decompile a DEX file into its corresponding SMALI files using baksmali, a program included with the smali package. For reading SMALI files, there is a Smali syntax highlighting addon for Notepad++ distributed by the Android Cracking blog.

NOTE: "Smali" stands for assembler in Icelandic. Iceland has a village named Dalvik from which the Dalvik Virtual machine was named. Similarly, "Baksmali" stands for disassembler.