Go to OSX Daily to read How to Open 7z Files on iPhone & iPad
7Z files are yet another compression format used to bundle files and transfer them online, so it’s not terribly unusual to run into 7Z or 7-zip files that you need to open on an iPhone or iPad.
Unlike opening regular zip files on iPhone or iPad via Files app, extracting and opening 7z/7zip files will require the use of a third party tool on the iOS/iPadOS device.
How to Open 7z Files on iPhone & iPad
For the purposes here, you can use either WinZip or iZip to open 7z files on your iPhone or iPad. The apps both work for opening 7z files so which you pick is up…