Thanks for the detailed report. I’ll look into it. Sorry for your bad experience.
The “outer” RethinkRAW.app is an AppleScript launcher that just handles file associations, compiled withosacompile. It’s not surprising that backwards compatibility goes way back.
The “inner” RethinkRAW.app is a Go binary wrapped by “hand” into an app bundle, with manually a written plist. I probably botched this. The release notes says 10.13 because that’s what Go 1.19 says it supports. The only thing special about this binary is that it is dual architecture (amd64/arm64)? Maybe that’s the root cause.
I can only really test on Ventura, which is what I have installed.
The binaries for the macOS zenity port (that I similarly created) use a similar build process. I would’ve hoped to have had negative feedback on those as well (since it’s a far more popular tool).