: Fan-made "remastered" versions of older mods often use this naming convention. For example, some users have created upscaled texture packs or consolidated mod collections for games like Final Fantasy VII using tools like ESRGAN or Gigapixel AI.
: Use a tool like 7-Zip to "Open Archive" rather than "Extract" first. Look for a readme.txt or .nfo file inside, which usually contains the developer's notes and version history. Onyx 2.0.1, or remastered, or something.7z
Providing the context of where you found it could help pinpoint the exact version. : Fan-made "remastered" versions of older mods often