Phew The command prompt method solved.
C:\Program Files (x86)\LilyPond\usr\bin>convert-ly -e -b "C:\users\peter\Lilypool\Music_Files\Bouffil\Opus7 No 1\alto.ly" convert-ly.py (GNU LilyPond) 2.19.81 convert-ly.py: Processing `C:\users\peter\Lilypool\Music_Files\Bouffil\Opus7 No 1\alto.ly'... Applying conversion: 2.15.7, 2.15.9, 2.15.10, 2.15.16, 2.15.17, 2.15.18, 2.15.19, 2.15.20, 2.15.25, 2.15.32, 2.15.39, 2.15.40, 2.15.42, 2.15.43, 2.16.0, 2.17.0, 2.17.4, 2.17.5, 2.17.6, 2.17.11, 2.17.14, 2.17.15, 2.17.18, 2.17.19, 2.17.20, 2.17.25, 2.17.27, 2.17.29, 2.17.97, 2.18.0, 2.19.2, 2.19.7, 2.19.11, 2.19.16, 2.19.22, 2.19.24, 2.19.28, 2.19.29, 2.19.32, 2.19.40, 2.19.46, 2.19.49, 2.19.80 C:\Program Files (x86)\LilyPond\usr\bin> But all this typing for one file is doomed to induce errors - so now to crack the batch file method. Thank all. Regards Peter
