.., if there are any!
It is no longer possible to doubleclick on a .ly file to compile a script.
Windows 11 cannot identify the specific program associated lilypond, so all you
see is an option to choose Lilypond 'Just once' followed by abject failure.
Windows only seems to recognise programs which they have classified as apps, so
no version appears in the list of default programs.
A similar problem has been reported with jpg and png files not being associated
with Photos. There is apparently a repair option that can be applied in that
case.
There may be some manual work-round. It was working for me on a very old
Lilypond version, and only stopped when I upgraded to 2.24.2. Reverting to the
old version, that now has the same problem.
Jonathan