We often come across corrupted RAR archives that cannot be extracted due to voids or incomplete binaries, and there is no way to open the files normally. AutoUnpack is a Windows application that repairs your damaged and corrupted archives, but, if, for some reason, it fails to perform its required task, you can take a look at Recovery Toolbox for RAR. It is a RAR repair tool which does not modify corrupted documents, and can easily open files which are not accessible. It does not matter which application was used to create the RAR archive; Recovery Toolbox for RAR can access it.