StorageFile manifestFile = await DownloadsFolder.CreateFileAsync("manifest.json", CreationCollisionOption.GenerateUniqueName);
await FileIO.WriteTextAsync(manifestFile, json);
var lines = await FileIO.ReadLinesAsync(manifestFile);
lines.RemoveAt(2);
await FileIO.WriteLinesAsync(manifestFile, lines);
StorageFile manifestFile = await DownloadsFolder.CreateFileAsync("manifest.json", CreationCollisionOption.GenerateUniqueName);
await FileIO.WriteTextAsync(manifestFile, json);
var lines = await FileIO.ReadLinesAsync(manifestFile);
lines.RemoveAt(2);
await FileIO.WriteLinesAsync(manifestFile, lines);