cmd cannot recognize dex2jar- Android Apk

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http://stackoverflow.com – i want to get source code from apk and use this solution Android: Getting source code from an APK file i try to dex file to jar and i used dex2jar; but cmd cannot recognize this command. dex2jar classes.dex "dex2jar is not recognized as an internal or external command" is dex2jar deprecated? what can i use to convert dex to jar? (HowTos)