No disrespect to Sigil, but it's a one trick pony - only handles one format - EPUB.
IMO the simplest way to access the old viewer on a Windows machine is to install an old version of Calibre Portable, e.g. 3.48 or 4.23, and make the viewer in it the default viewer for your most often viewed formats and tell calibre not to use its viewer for those file types. You can use calibre's Open With feature to access the new viewer as required.
If you're looking for a snappy EPUB only viewer try Aquile.
Added: Quite a few people use Sumatra as their 'universal' viewer.
BR
Last edited by BetterRed; 11-07-2021 at 03:11 AM.
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