Thanks for taking the time to test!
All these viewers are built different and with different focus. My viewer started out as a macOS version only, and it was only after a number of request I grudgingly accepted the challenge to build a Windows version as there was a very large difference in the code base between KokuaOS and the macOS version at the time.
There is still quite a bit of a difference, as can be seen by the version numbers. Functionality wise they are more or less the same, but the code lags on the Windows version – which is why there still only is the 32-bit version.
I only also have a very limited test environment for the Windows version, as it is basically built and tested in VMware virtual machines. For the macOS version I have a range of hardware to test on up to the latest M1 ARM chip.
I don't know how I will handle the Windows 11 release Microsoft lets lose on the market Oct 5 as I don't own any hardware that can run it.
The macOS version is even more of a challenge given that Apple have deprecated OpenGL and most likely will remove support for it completely next year. Leaving Metal as the only option. That again requires a complete rewrite of the viewer more or less ground up. I am not sure anyone can handle it, not even LL given how they struggle with the current macOS version.