Compilation errors with Emacs lilypond-mode

[Thorsten]

Hi List,
on win7 with emacs 23.2.1 and freshly installed lilypond-mode version 2.5.20 
plus lilypond version 2.14.2 and the following truly minimal file


\relative c' {
  c d e f g a b c
}


I get compilation errors within Emacs (doing C-c C-l), but not when I drag the 
file on the desktop over the lilypond symbol. 

at Line 1252 in compile.el (in defun compilation-start)


        (insert "-*- mode: " name-of-mode
                "; default-directory: " (prin1-to-string default-directory)
                " -*-\n"
                (format "%s started at %s\n\n"
                        mode-name
                        (substring (current-time-string) 0 19))
L 1252  ->      command "\n")

I get the following error:
File mode specification error: (invalid-regexp "Unmatched ( or \\(")
if: Invalid regexp: "Unmatched ( or \\("

the variable 'command' hold the following string when the error occurs:
"lilypond \"c:/Users/tj2/Desktop/lily-test\".ly"
that works just find on a windows command prompt. 

TIA for any hints
cheers
Thorsten