Unicode is incompatible with a number of applications, especially older applications, and I can't imagine a reasonable excuse for using it in computer file names, if for no other reason than common sense compatibility.
I run into problems with Unicode when working with music files fairly often, as some people absentmindedly tag file names with it. The only way I know to fix the issue is to copy-paste offending filenames into Windows Notepad; save that file to strip Unicode out; exit and reload the file; and copy-paste the clean file names over the old ones. This sucks.
Could Bulk Rename Utility have an option to strip Unicode out of file names?