"Open with" context menu missing

A change to one of our client's machines caused the "Open with" context menu to disappear. This menu appears when you right click on a document or other data file that's not an executable or shortcut. After checking with Microsoft, we found the solution from MS MVP Daniel Martin:

1. Click Start, All Programs, Accesories, Notepad.

2. Copy and paste this text:

Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\Open With]
@="{09799AFB-AD67-11d1-ABCD-00C04FC30936}"

3. Click File, Save As, name the file "OpenWith.reg" (WITH THE QUOTATION MARKS) and click OK.

4. Now double-click OpenWith.reg, click Continue, Yes, OK, and see if the problem is solved.

This registry addition resolved the issue perfectly. Thanks!