Cannot preview txt and html email attachments in Outlook 2019 x64

%3CLINGO-SUB%20id%3D%22lingo-sub-2357621%22%20slang%3D%22en-US%22%3ECannot%20preview%20txt%20and%20html%20email%20attachments%20in%20Outlook%202019%20x64%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2357621%22%20slang%3D%22en-US%22%3E%3CP%3EHello%2C%3CBR%20%2F%3Ewhen%20I%20try%20to%20preview%20a%20txt%20or%20html%20attachment%20in%20Outlook%202019%20(on%20Win%2010%2020H2%20x64)%20email%20I've%20got%20an%20error%3A%3C%2FP%3E%3CP%3E%3CFONT%20color%3D%22%233366FF%22%3E%3CEM%3EThis%20file%20cannot%20be%20previewed%20because%20of%20an%20error%20with%20the%20following%20previewer%3A%3C%2FEM%3E%3C%2FFONT%3E%3CBR%20%2F%3E%3CFONT%20color%3D%22%233366FF%22%3E%3CEM%3EWindows%20TXT%20previewer%20(Html%20Previewer)%3C%2FEM%3E%3C%2FFONT%3E%3CBR%20%2F%3E%3CFONT%20color%3D%22%233366FF%22%3E%3CEM%3ETo%20open%20this%20file%20in%20its%20own%20program%2C%20double-click%20it.%3C%2FEM%3E%3C%2FFONT%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAnd%20it%20is%20ok%20with%20xlsx%2C%20docx%2C%20pdf%20and%20images%20previews.%3C%2FP%3E%3CP%3E%3CFONT%20color%3D%22%233366FF%22%3E%3CEM%3EPreviewHandlers%3C%2FEM%3E%3C%2FFONT%3E%20key%20is%20in%20the%20Registry%20and%20seems%20to%20be%20ok.%3C%2FP%3E%3CP%3EAlso%20I%20have%20no%20previews%20at%20all%20(blank%20preview%20without%20any%20text%2C%20except%20images%20and%20videos)%20in%20Explorer%20Preview%20pane%20(for%20what%20it's%20worth).%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2357621%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EOutlook%20for%20Windows%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
Frequent 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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