Learn how to add Unblock a File to Windows right-click context menu. Use a PowerShell 3.0 commandlet, add an entry to the Registry and you are all set!

The process is similar to creating any plain text file in PowerShell -- but with a few twists.

Looking at the signature of a file quickly lets you know whether that file is really what it claims to be. Here's how to tap PowerShell to figure out the file signature.