Cannot preview txt and html email attachments in Outlook 2019 x64

Regular Visitor

Hello,
when I try to preview a txt or html attachment in Outlook 2019 x64 (on Win 10 20H2 x64) email I've got an error:

This file cannot be previewed because of an error with the following previewer:
Windows TXT previewer (Html Previewer)
To open this file in its own program, double-click it.

 

And it is ok with xlsx, docx, pdf and images previews.

PreviewHandlers key is in the Registry and seems to be ok.

Also I have no previews at all (blank preview without any text, except images and videos) in Explorer Preview pane (for what it's worth).

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