Remove program entries in the "Open With" list

The following tip requires editing the Windows Registry. Be sure to make a backup copy of the registry prior to making any changes to it.
The "Open With" list can be found in one of the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\<>\OpenWithList
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\SystemFileAssociations\<>\OpenWithList