How can I remove a program from the Open With when right clicking?

A. Each entry in the "Open With" has an entry in the registry HKEY_CLASSES_ROOT called <extension>_auto_file, e.g. doc_auto_file for work. To remove the entry just delete the base <extension>_auto_file tree in the registry. If you were unsure you could use the following:

  1. Start the registry editor (regedit.exe)
  2. Search for the name of the exe you want to remove from the "Open With" menu
  3. If a match is found, and its root is HKEY_CLASSES_ROOT/xxx_auto_file then delete the tree HKEY_CLASSES_ROOT/xxx_auto_file
  4. Close the registry editor

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