According to Microsoft documentation, not only the following characters are not supported in VFAT <>:"/\|?* but also filenames cannot end with space of dot. This last part is not corrected by the "VFAT-safe file name" option when renaming tracks. For example, songs ending with "..." create a problem.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
Git commit fc9cce2bd8483a0473ea9b2514f239c07625466d by Stefano Pettini. Committed on 22/02/2018 at 23:45. Pushed by spettini into branch 'master'. VFAT-safe file and directory names cannot end with dot This adds special handling of trailing dots to vfatPath(), that are replaced with '_'. This doesn't affect '.' and '..'. ../Music/R.E.M./Monster -> ../Music/R.E.M_/Monster Unit tests updated, minor bugs when vfatPath() is invoked with a PathSeparatorBehaviour not matching the system detected by improving unit tests and fixed. M +23 -11 src/core/support/Amarok.cpp M +43 -11 tests/TestAmarok.cpp https://commits.kde.org/amarok/fc9cce2bd8483a0473ea9b2514f239c07625466d