Converting that file I got the warning
"Tuplet 2/3 can't be processed.
Staff: P1/staff-2/voice-3, measure: 38"
This can be solved using this trick:
!NoteWorthyComposerClip(2.751,Single)
|User|TupletMarks.fso|Pos:11.5|span:2|number:2
|Note|Dur:8th,Dotted,Slur|Pos:7|Opts:Stem=Down,Beam=First,XDotSpace=-1
|Note|Dur:8th,Dotted|Pos:6|Opts:Stem=Down,Beam=End,XDotSpace=-1
|User|TupletMarks.fso|Pos:10.5|span:2|number:2
|Note|Dur:8th,Dotted,Slur|Pos:5|Opts:Stem=Down,Beam=First,XDotSpace=-1
|Note|Dur:8th,Dotted|Pos:4|Opts:Stem=Down,Beam=End,XDotSpace=-1
!NoteWorthyComposerClip-End
This is just for information; I think implementing it in the program is too much hassle for too little.
By the way: the music notated in NWC is attached here. No need to say that it's a joke a friend of mine sent me!
"Genetliaco" is a very erudite form of "birthday"...