Welcome to the CHICKEN Scheme pasting service

// Really, who comes up with this shit?

window.resolveLocalFileSystemURL(
    files[filename],
    function(fe) {
        fe.file(function(f) {
            var fr = new FileReader();
            fr.onloadend = function(e) {
                callback(e.target.result);
            };
            fr.onerror = function(e) {
              throw e;
            };
            fr.readAsText(f);
         }, function(e) {
            throw e;
         });
     }, function(e) {
         throw e;
     }
 );