g_spawn and files left locked on windows.

[Richard Shann <richard shann virgin net>]

My application invokes the lilypond program using the g_spawn...
functions. This works fine on linux, but on windows the files created by
lilypond are left locked when lilypond has exited. I can't re-use them
on the next invocation, for example.
Should I be exploring this as a possible bug in lilypond, or could there
be something about the way I invoke it?
Richard Shann