It supports high compression ratios (using LZMA/LZMA2), strong AES-256 encryption, and file sizes up to How to Open/Unzip Irk17.7z
Tools like WinRAR or The Unarchiver (for macOS) can also extract .7z files. Irk17.7z
If an application (like Calibre) does not recognize .7z , you may need to unzip it first and re-zip it into a .zip format. If you can provide more context, such as: Where did you download or receive this file from? strong AES-256 encryption
Here is a general guide to handling .7z files like Irk17.7z : What is a .7z File? a game mod
What is the (e.g., a game mod, a book, software, data)? I can provide more specific instructions on how to use it.