When I download Mac applications they come in a .app extension. When I right click and view package info I see a lot of files in it. What are these files? Does it
mean the apps are open source? Also how can I go about on decompiling an application? On Windows I was able to use s hex editor and decompiling sofware to mess with the internals in making the app do new things. How does it work on the Mac??
Macos – Decompile Mac applications
macmacos
Best Answer
.app folders are called bundles. They are a simple presentation for application and allow easy move or uninstallation. Mac OS uses bundles in every places when it needs to show one entity that contains multiple files (Frameworks, Preferences Pane, Plugins, etc.).
See http://developer.apple.com/mac/library/DOCUMENTATION/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html#//apple_ref/doc/uid/10000123i-CH101-SW13 to learn more about how they are structured.