LibreOffice 6.4 installer hijacks file type associations though told not to do so

Hi folks,
today I did a fresh install of LibreOffice 6.4 on my Windows 10 system.

During the installation routine I explicitly unchecked any file type association check boxes.
Yet, after the installation completed, all file type associations (doc, docx, xls, xlsx, csv, …) were hijacked by LibreOffice.

Anyone else having had this issue?

Hijacked from which application?