“Self extracting zip file.”
Along with auto-mutating virii that are designed to evade anti-virus programs, no doubt.
The safest way to deal with this might be to extract it on a virtual machine, get the extracted file(s), which, hopefully, don’t contain virii of their own, and then delete the VM.
The copy I downloaded was a plain old zip file, scanned clean both with my local stuff and on VirusTotal, and did nothing crazy. As someone else pointed out in another thread, the file extension will default to being recognized as a certificate on some versions of Windows, but they’re not.