Extract 7z files directly on your Vita without using ePSP

[dlevere]

Back in August 2016, VitaShell 0.8 was released for HENkaku enabled devices and while it brought about many features (such as customization) and bug fixes, 7z and RAR support were dropped in favor of support for ZIP files larger than 2GB. While RAR support was re-added in a later release of VitaShell, 7z support didn't, so 7zShell came into existence.

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