The SDK You Love,
Now for Windows

public sealed partial class ManualView : Page
{
    PSPDFKit.API _API;

    // Once the WebView is ready create an instance of the API and initialize it with the WebView
    private void MainWebView_NavigationStarting(WebView sender, WebViewNavigationStartingEventArgs args)
    {
        const string license = "YOUR LICENSE GOES HERE";
        // This is the location of the standard CSS for Windows
        // You may provide your own CSS. See The CSS section here https://pspdfkit.com/api/web/css-General.html
        const string css = "ms-appx-web:///Assets/pspdfkit/windows.css";

        _API = new PSPDFKit.API();
        _API.InitializeWithWebView(license, css, sender);
    }

    private void MainWebView_NavigationCompleted(WebView sender, WebViewNavigationCompletedEventArgs args)
    {
        // The WebView has loaded the UI and is ready
    }

    private async void Button_OpenPDF_Click(object sender, RoutedEventArgs e)
    {
        // Open a Picker so the user can choose a PDF
        var picker = new Windows.Storage.Pickers.FileOpenPicker();
        picker.ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail;
        picker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;
        picker.FileTypeFilter.Add(".pdf");

        var file = await picker.PickSingleFileAsync();

        if (file != null)
        {
          // Open and display it in the PSPDFKit PDFView
          await _API.OpenAsync(file);
        }
    }
}