It's possible that the archive contains patches for the application. Patches are small pieces of software designed to update, fix, or improve a software program. In this case, the patch might fix bugs, improve performance, or add new features to the Crunchyroll app.
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: Files with names like this are common "clickbait" for malware. Hackers name files after popular services (like Crunchyroll) to trick people into downloading viruses, ransomware, or "bricks" that intentionally destroy a console's firmware. Crunchyroll -NSp--Update 1.7.0-.rar