You might have realized with Windows 8 that the button for File Unblock is not there in File Properties. The button was there in files of File Properties from other PCs or was directly downloaded. The security feature was very crucial in protecting one from the onslaught of alien files.
The file is missing in Windows 8 meaning that when downloading a zip file online, you have to answer a couple of security prompts before the file is loaded.
Unblocking a downloaded file for those using Windows 8:
1. Firstly, run the commandlet PowerShell 3.0 unblock file in the form: Unblock-File.\php_manual_en.chm. A good number of people using Windows might find this path unfamiliar or unusual.
2. You could add an entry of ‘Unblock File” in the context of your right-click menu to make the unblocking of files easy.
3. To have this done, simply copy this: HKEY_CLASSES_ROOT\*\shell\powershell]@=”UnblockFiles”[HKEY_CLASSES_ROOT\*\shell\powershell\command]@=”C:\\\\Windows\\\\system32\\\\WindowsPowerShell\\\\v1.0\\\\powershell.exeUnblock-File-LiteralPath’%L’” and paste it on a notepad and save it in form of .reg file.
4. Double click on the entry to have the content added on the registry.
5. Any right click action on an alien file gives an option of unblocking a file.
There are other options you could explore by downloading registry files that are ready to use.