tmnxSysRollbackFileType is used by tmnxSysRollbackStarted,
tmnxSysRollbackSaveStarted, tmnxSysRollbackDeleteStarted,
tmnxSysRollbackStatusChange, tmnxSysRollbackSaveStatusChange, and
tmnxSysRollbackFileDeleteStatus notifications to indicate
the type of file involved in a rollback operation.