Folders/Files with special characters not 'seen' by LMS

My LMS 8.1.2-1614990085 doesn't seem to detect folder or file names with specal characters, specifically these (unicode value in parentheses):
(U+02BB) ʻ
(U+0100) Ā
(U+0101) ā
(U+0112) Ē
(U+0113) ē
(U+012A) Ī
(U+012B) ī
(U+014C) Ō
(U+014D) ō
(U+016A) Ū
(U+016B) ū

When folder/file names have any of those characters they are missed by the scanner. They are also not seen if I try and browse LMS 'My Music' by 'Disks and folders'. Previously had older versions of LMS, had the same problem with them. No other programs on the PC have any problems seeing them. What's weird is that those characters work just fine as metadata (written by MP3Tag) whether in flac, mp3, etc.

PC is on Win 10 Home 20H2, was upgraded from Win 8.1 some time ago.

Anything I should look for?
Help, please

Thanks!