We do not take responsibility for any damage, or legal issues, done with these files here at AT Products LLC, Ethical Hacking Society, The Script Community, CodingHome, or Noodle Hackerspace.
Use a virtual machine if it's a computer virus, and never open them on your physical machine. As a pre-caution, download them on your VM.
If it's a APK file, use a APK Emulator.
More information on Virtual Machines (VM)
More information on APK Emulators