I use the UTF-8 character 'letter modifier colon' (ea 9e 89), which looks like '꞉', to get around the 'no colons in path names' Windows restriction. So I can have a path name like F:/Video/Marvel's Thor꞉ Ragnarok/Marvel's Thor꞉ Ragnarok (t01).mkv, and Windows is quite happy (first one is a real colon, the second and third are 'letter modifier colons').
Unfortunately, I don't appear to be able to type extended UTF-8 characters in the 'Output Folder' field. I can type the desired path in pretty much any other app, and copy-paste it into that field in MakeMKV, and that works just fine. But that same character doesn't appear if I type it directly into that field.
Not an earth-shattering bug, to be sure, but it's irritating in a 'pebble in your shoe' kinda way.