With the latest updated of Studio 2017 version 14.1.6413.8 the Rich Text Format (RTF) filter has upgrade to RTF v 2.0.0.0 which no important parser to define "Non-translatable texts" (use for specific text can be excluded from translation) that normally available with RTF v 1.0.0.0 when use Studio 2017 version 14.1.6278.0. The RTF file should not be opened or edited in Microsoft Word. Word will automatically format text and may cause issues when re-import RTF back to original format. The "Non-translatable texts" was a great feature in Studio, then it should be remained as choice to use.