When you view files on a Mac-formatted drive, you can change the way the filenames are displayed for that drive from the shortcut menu.
This mode maximizes compatibility with a wide range of software, and preserves international characters where possible.
This mode is appropriate for a disk containing files named using international Unicode characters, in cases where preservation of those characters is important, but compatibility with a wide range of software is less important. This is the default setting.
This mode is appropriate for tape backups of Mac disks, or transfers of files from one Mac disk to another, including between a true Mac disk and an NTFS volume storing a Services for Mac network share. This mode preserves Unicode characters, but, unlike the other two modes above, does not append artificial file name extensions for software-compatibility purposes.