23331.7z

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The official, free, open-source utility for this format. 23331.7z

If you did not expect to receive a file named 23331.7z , exercise caution. Compressed archives are frequently used to bypass basic email filters to deliver malware. Always before extracting the contents. Popular third-party tools for Mac users

This indicates the file is a 7-Zip compressed archive . 23331.7z

It uses the Lempel-Ziv-Markov chain algorithm (LZMA), which typically offers higher compression ratios than standard .zip files.