Edit MacOSXBundleInfo.plist.in
Many file types in macOS are not being opened by Kate.
The file types need to be added to "info.plist" file in the application bundle.
The macOS Launch Services will need to be refreshed after updating info.plist
*** This is my first attempt at submitting something like this, so please excuse any mistakes in procedure. I am using this configuration now, and it works well.
REBUILD Launch Services, and reload Finder:
/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user
killall Finder
*** If you crash Kate after making changed to info.plist, you will need to codesign it.