[texworks] PDF support for not-synctex compilers

[Helge Kruse]

I use TeXworks for my LaTeX works as well as for editing Lilypond 
scores. That works fine in general. But the PDF viewer does not close 
the PDF file and it is locked until the PDF viewer is closed.

Since Lilypond does not has any idea what synctex is, it fails to write 
the next PDF file.

Would it be possible to close the PDF file (not necessarily the viewer) 
when the Typeset is started?

Regards,
Helge