It supports high compression ratios (using LZMA/LZMA2), strong AES-256 encryption, and file sizes up to How to Open/Unzip Irk17.7z

Here is a general guide to handling .7z files like Irk17.7z : What is a .7z File?

What is the (e.g., a game mod, a book, software, data)? I can provide more specific instructions on how to use it.

Tools like WinRAR or The Unarchiver (for macOS) can also extract .7z files.