I think that a Windows 'thing', if I select 20 .txt files (which has Notepad++ as the default handler) and right click there's no Open option.
What happens if you select 16 .epub files and then press Enter, rather than look for right click Open. I get an "Are you sure you want to open all those files" message, if I confirm then the 16 files are opened in the default handler - ebook-viewer.exe.
Interestingly, if I select multiple .mp4 files and right click, the Open is replaced by Play (even if it's just 2 files), and if I select more than 15 files I don't get the "Are you sure…" message. My default handler for .mp4 files is the Movie & TV player that comes with Win 10.
BR
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