DigiKam will run on Windows, though it has the serious glitch of creating tiff files that are next to impossible to delete.
Rawtherapee, at least on my Windows7 machine, can only see raws in odd folders and then doesn’t do a good job of extraction.
Good of you to call attention to Corel’s Aftershot, it’s something DPReview just ignored when they did the raw extraction software roundup a few months back. And I see it’s still being ignored.
There’s also PhotoNinja, from PictureCode, it’s good at extracting raws but it’s a resource hog and slow.
For editing, not raw extraction, there’s the $80 PhotoLine and then also the freeware Paint.net–it looks like MSPaint but is much more powerful, has curves, opens 16 bit tiffs.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.