Use an updated scanner like Microsoft Defender or Malwarebytes.

If the file is a mod, it likely requires the base Green Hell game installed on Steam or a similar platform to function. Security and Risk Assessment

A full game should be several gigabytes, while a simple mod or save file should be significantly smaller.

Backups of player progress or "perfect" game saves meant to be imported into a local directory. Technical Characteristics

Community-created content such as custom textures, new items, or gameplay balance tweaks.

RAR (Roshal Archive), which requires software like WinRAR or 7-Zip to extract.