For a cunning little bauble of an entertainment, the 2001 French film 'Amélie' inspired uncommonly extreme responses. People were usually head over heels about it ('It's so cute!') or violently allergic to it ('But it's so cute!'). The mild-mannered musical adaptation of this movie, which opened on Monday night at the Walter Kerr Theater, is unlikely to stir similar passions. Featuring a book by Craig Lucas and music by Daniel Messé, with the lush-voiced Philippa Soo in the title role, it is pleasant to look at, easy to listen to and oddly recessive. It neither offends nor enthralls. Say what you will about its cinematic prototype, directed with an auteur's flourish by Jean-Pierre Jeunet, it had style to spare, not to mention the courage of its worldly but whimsical convictions. In other words, 'Amélie' the movie was très, très Français. 'Amélie' the musical seems to have no nationality, or sensibility, to call its own.