@Peter_Foiles I regularly upload nightly WIN64 builds at https://drive.google.com/open?id=0B2q9OrgyDEfPS2FpdDAtMVI1RG8
Download the latest dev build.
You have to verify if it supports raf files.
Note:
The topic containing the link download-rawtherapee-development-builds to this google drive is buried in the depths of the forum.
Nevertheless it is accessible through the first pinned post Welcome to the RawTherapee forum - read this first
So the best is to record the direct link to the google drive for future downloads.
Please wait a few minutes as I am building an up to date dev build.