Well I did not put them there, that's for sure. Have a look at this thread -
Install/Uninstall Windows 10 calibre
And the calibre-debug --default-programs command
Quote:
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(Un)register calibre from Windows Default Programs. --default-programs = (register|unregister)
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And what goes on behind the CALIBRE_NO_DEFAULT_PROGRAMS environment variable - which Kovid implemented last week to address this issue
Quote:
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Prevent calibre from automatically registering the filetypes it is capable of handling with windows.
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BR