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7z Extractor
List and extract .7z (and zip/tar the same engine reads): real extraction into the wasm filesystem, sizes from files 7-Zip produced, extract-only.
Listing is real extraction into the wasm's own in-memory filesystem, sizes come from files 7-Zip actually produced, not header claims. Encrypted archives that need a password fail honestly (this page never asks for secrets); creating .7z files is not offered.