Be extremely cautious when downloading .reg files or registry "tools" from unofficial sources. Since the registry controls core system behavior, executing a malicious script can break your OS or create security vulnerabilities. Always verify the source and manually inspect the contents of a .reg file by right-clicking it and selecting .
To open the real Registry Editor safely: windows registry editor version 5.00 download
So if you see Windows Registry Editor Version 5.00 , it just means the file was created on a modern version of Windows. Be extremely cautious when downloading
You don’t download the editor , but you might want to download a (a .reg file) to tweak a setting. For example, "Show file extensions" or "Disable Cortana." "Show file extensions" or "Disable Cortana."