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I have several processes that generate files with no extension at all and would like to add a custom context menu menu (i.e. be able to right click on them and select 'open in Notepad' or 'make .txt file' etc)

I know I can associate (add) a command (e.g. "OpenNotepad") for a particular filetype (extension), or all filetypes...

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\*\Shell\OpenNotepad]    ​      <--  All files/folders
[HKEY_CLASSES_ROOT\txtfile\Shell\OpenNotepad]    ​<-- .txt files

But how can I do this for files that have no extension?...

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\ ?? \Shell\OpenNotepad]      ​<--  Files with no extension?
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  • Happy to provide an example, but don't want to get too side-tracked... So, for as example, Windows downloads Spotlight login page background images to: %LocalAppData%\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets. They are JPEG-format images (.JPG) but are stored as extensionless-GUIDs (e.g. 2e2156afe6cf9fc53c0cd36177d1216ccb0986dbdea7183d6a337db055ec041b)
    – Martin
    Jun 5 at 15:40
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To add shell menu entries for files with no extension, use this registry branch:

[HKEY_CLASSES_ROOT\.\Shell]

Example:

[HKEY_CLASSES_ROOT\.\Shell\OpenNotepad]

References:

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