Seems to work for me:
!NoteWorthyComposerClip(2.75,Single)
|Clef|Type:Treble
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th,Slur|Pos:0
|Bar|Style:MasterRepeatOpen
|Note|Dur:4th,Slur|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th,Slur|Pos:0
|Bar
|Ending|Endings:1
|Note|Dur:4th,Slur|Pos:0
|Note|Dur:4th,Slur|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:MasterRepeatClose|SysBreak:Y
|Ending|Endings:2
|Note|Dur:4th,Slur|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:SectionClose
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
!NoteWorthyComposerClip-End