Downloading a file on Windows phone using PhoneGap - windows

Question

With the help of this link 'https://gist.github.com/nathanpc/2464060' I have written code to download a file in PhoneGap. I tried it on Android phone and it works perfectly.
But on Windows phone, It says that it has downloaded and the path is -- //xyz/SIFA.pdf.
To look at the file system on Windows phone I have downloaded an app called 'Files' using which I looked up on the phone but I could not find any folder xyz nor the file.
I also connected the Windows phone to my PC and had a look but could not find the folder nor the pdf
Could you suggest what I am doing wrong in the code or if I am not looking for the file in the right way.
Thanks for your help in advance
Here is my code to download file in PhoneGap.
I have added alerts to indicate the progress.
var folderName = 'xyz';
var fileName;
var downloadFileOne = function (URL) {
//step to request a file system
alert("step one");
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, fileSystemSuccess, fileSystemFail);
alert("step two");
function fileSystemSuccess(fileSystem) {
alert("step three");
var download_link = encodeURI(URL);
alert("step four - " + download_link);
fileName = download_link.substr(download_link.lastIndexOf('/') + 1); //Get filename of URL
var directoryEntry = fileSystem.root; // to get root path of directory
directoryEntry.getDirectory(folderName, {
create: true,
exclusive: false
}, onDirectorySuccess, onDirectoryFail); // creating folder in sdcard
alert("step five");
var rootdir = fileSystem.root;
var fp = fileSystem.root.toNativeURL(); // Returns Fullpath of local directory
fp = fp + "/" + folderName + "/" + fileName; // fullpath and name of the file which we want to give
// download function call
filetransfer(download_link, fp);
}
function onDirectorySuccess(parent) {
// Directory created successfuly
alert("directory created successfully");
}
function onDirectoryFail(error) {
//Error while creating directory
alert("Unable to create new directory: " + error.code);
}
function fileSystemFail(evt) {
//Unable to access file system
alert(evt.target.error.code);
}
}
function filetransfer(download_link, fp) {
alert("step six - file transfer method");
var fileTransfer = new FileTransfer();
// File download function with URL and local path
fileTransfer.download(download_link, fp,
function (entry) {
alert("download complete: " + entry.fullPath);
},
function (error) {
//Download abort errors or download failed errors
alert("download error source " + error.source);
}
);
}