We had an interesting support issue today and CADWorx ended up needing to be re-installed due to Windows 7 (and above) automatically blocking files that are downloaded from the internet. When you install a hotfix from SmartSupport you need to make sure you “UNBLOCK” the file in its properties.

To do that you will need to right click the file and select the unblock option. 

It is also important to UNBLOCK zip flies before extracting them. As you can see in the image the block will happen for any file downloaded, and most of the time you will not notice. You can go through the entire install or extraction and everything appears to be working properly. Then you try to use the software and it doesn’t work.

If you download and need to unblock many files, There are ways to disable Windows 7 file protection, but that should only be done by qualified IT personnel. 

You can also add the unblock feature to your Context Menu  by using a registry edit as shown below. 

(Editing the Registry can cause serious issues if not done correctly. Do not edit the registry unless you are completely comfortable within the regedit environment)

Windows Registry Editor Version 5.00

@="Unblock Files"

@="C:\\\\Windows\\\\system32\\\\WindowsPowerShell\\\\v1.0\\\\powershell.exe Unblock-File  -LiteralPath '%L'"

To use the text above: 

  • Create a new text document
  • Paste text above into the text document
  • Rename file to: UnblockContextMenu.reg
  • Double click new file to merge these settings into your registry

Once ran, you should see this in your context menu when you right click on a file


Hopefully this will keep you from pulling your hair out from an anomaly in the software due to a bad install.

How to permanently unblock downloaded files

If you want to completely prevent Windows from adding the zone information in the file's alternate data stream so you don't even need to unblock such files, follow these steps:

  1. Open Group Policy Editor by typing gpedit.msc into the Start Menu.

  1. Go to User Configuration -> Administrative Templates -> Windows Components -> Attachment Manager.
  2. Double click the policy setting "Do not preserve zone information in file attachments". Enable it and click OK.