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Subject: Re: creating a custom Windows Search and Windows Preview shell extension
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It's basically a question of Registry entries (IIRC).
You can have a look at AZip's shell extensions for files and folders, it's configured by the Ada code.
Search from: gwindows/azip_gwin-installation.adb
In the UI: menu: Options / Install AZip, then the "Context menu: Manage" button.

AZip: http://azip.sf.net/

Sources:
https://sourceforge.net/p/azip/code/HEAD/tree/
https://github.com/zertovitch/azip