Ho ho ... years ago, I bought a Sigma DP2 Merrill ("huge" 45MP raw files) and dutifully down-loaded their proprietary converter to my 32-bit one-core HP machine running the wonderful Windows XP. Adjusted something and waited a minute or so for it to show up in the Review window. I am not one to rush to latest OS just because someone wrote something that slows it to a crawl, so I sold the camera.