If you want to learn more about .apk files here is a good tutorial on how to unpack and repack these for your Android device. XDA member despotovski01 prepared an interesting guide for which you just need to follow the instructions and you will learn how to unpack/repack .apk files fast and easily. You will need Winrar or similar program and Formatter, which is an application made by the developer, in order to make it work. If you don´t want to mess with Command Prompt, then this option will give you a very graphical/simple user interface to make the changes you want.

Please let us know what you think.

Originally posted by despotovski01

Hey guys!

I've made another tutorial. This one is about unpacking and repacking .apk files. This tutorial was made for people who don't want to mess with Command Prompt, or for those who want to do it in graphical user interface.

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Requirements:

-An archive manager, such as WinZip, WinRar, or Power Archiver, that is capable of extracting and making .rar archives

-Formatter (it's a program made by me) - click here to download it. Mirror: http://www.mediafire.com/?5a74bjg475er75d

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Tutorial:

Just follow the steps and you will learn how to unpack/repack .apk file in no time!

Head over the tutorial thread to find more.