The use of the extension is deliberate. When dealing with thousands of small ROM files, standard ZIP compression is often inefficient. The 7-Zip format utilizes the LZMA and LZMA2 algorithms, which offer a significantly higher compression ratio. This allows a massive library of Game Boy history—which would otherwise take up gigabytes of space—to be distributed in a much more manageable file size. Preservation vs. Distribution
Given the name, it's also possible that "platinum.7z" refers to a file that requires a password to extract its contents, possibly implying that it contains sensitive or premium ("platinum") data. platinum.7z
A database of roughly 240 master ROMs for the Game Boy and Game Boy Color. This included several unreleased or prototype games such as Pokémon Picross , Kirby Family , and the English version of Gargoyle's Quest II . The use of the extension is deliberate
Once installed, find your "platinum.7z" file, right-click on it, and select "7-Zip" > "Extract Here" or "Extract files…" to choose a destination. If prompted, enter the password if the archive is encrypted. This allows a massive library of Game Boy