Click "More Info" and "Run Anyway".
If this file is from a specific game, let me know the or the platform you got it from (e.g., Patreon, Itch.io). This will help me provide a specific installation or walkthrough guide.
This file name often suggests it is a compressed archive, typically associated with adult-themed visual novels or content distributed through platforms like Itch.io or Patreon.
To open .7z files, you need software like 7-Zip (Windows, free) or The Unarchiver (macOS). 2. Extraction Steps
Ensure the Y Sister.7z file is fully downloaded.