If you are looking for the "solid story" behind the file extension and why it’s often preferred over standard ZIP files, it boils down to two main advantages: efficiency and solid compression . The "Solid" Story: Why 7z is Different
The .7z extension is a staple in the gaming and emulation communities for a few reasons: aimstype.7z
Knowing the software you're using can help troubleshoot the issue. If you are looking for the "solid story"
For massive ROM sets or game assets, the space savings compared to ZIP can be measured in gigabytes. In a standard ZIP, each file is compressed individually
In a standard ZIP, each file is compressed individually. In a "solid" 7z archive, all files are treated as one massive data block.
Unlike some proprietary formats, 7-Zip is open-source and widely considered safe for distributing large software packages.