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Restoring the GCF context menu in Windows 10

This page offers instructions for Windows 10. If you are using a Windows version before ten, please visit the "Restoring the GCF context menu in Windows versions before Windows 10" page.


When Scream! is installed, it adds a number of items to the Windows explorer context menu – the menu that appears when you right-click on a GCF file – including the “View with Scream” option.

There have been a few reports of this facility being broken. In these cases, right-clicking on a GCF file will produce a menu with the normal Scream context menu items missing.

This document describes a procedure by which the missing context menu items can be restored on a Windows 10 PC.

The procedure

The procedure involves clearing any existing file association entries from the Windows registry and then re-registering the library (dll) that implements the menu items.

The context menu is implemented by a library called gcfmenu.dll, which is part of the Scream distribution and should have been installed into the same folder as Scream. If you have installed Scream to a non-standard location, use that location in place of the folder C:\Program Files (x86)\Guralp Systems\Scream4.6 in the instructions below.
  1. Click the Start button and, in the Search Programs and files field, type cmd. When the program is found, right-click on it and select Run as administrator.

    Starting a command prompt as Administrator
  2. The User Account Control dialogue should appear, asking whether to allow Windows Command Processor to make changes to your device - click yes.

    The User Access Control prompt
  3. Change directory to the folder where Scream is installed. For example, if Scream is installed under Program Files (x86), enter the command

    cd "C:\Program Files (x86)\Guralp Systems\Scream4.6"
  4. Enter the command regsvr32 /u gcfmenu.dll and click The "OK" button in the resulting confirmation window.

    Un-registering gcfmenu.dll
  5. Enter the command assoc .gcf=:

    Unassociating the .gcf file extension
  6. Enter the command regsvr32 gcfmenu.dll and click The "OK" button in the confirmation window.

    re-registering gcfmenu.dll
  7. Locate a .gcf file and right-click on it. You should now see the normal Scream context menu entries, as shown below:

    The normal context menu