Use a sandbox or virtual machine (VM) if you must open it to explore its contents.
If you can tell me or what you expected it to do , I can try to find more specific information. mortalcicada.7z
Based on the structure, this is likely a (indicated by .7z ) rather than a traditional software program. Use a sandbox or virtual machine (VM) if
Here is an analysis based on the potential nature of such a file: mortalcicada.7z
As this file appears to be from a non-mainstream source, you should exercise extreme caution . Do not open it unless you trust the source explicitly.