Unlock files in batch

Some times you need to open a .NET solution downloaded from the Internet, compile it and run it. You may fail in building the solution, and the behind reason is that Window 7 block the access to some files such as .dll files due to some security concern.

If you inspect the property panel of that files, you may see:

Ref: http://geekswithblogs.net/wildturtle/archive/2011/11/08/all-in-a-days-work-unblocking-multiple-downloaded-files-with.aspx