以幻灯片模式打开PowerPoint演示文稿- c#

我试图以幻灯片放映模式直接打开PowerPoint演示文稿。我试过使用一个进程(如下所示)，但我从PowerPoint得到一个错误消息，说它找不到文件，错误消息"PowerPoint无法读取C://Users/Route%20Plotter.pptx"。这个问题是由文件名中的空白引起的，因为当它被删除时它会起作用。

string powerPointPath = @"C:'Program Files'Microsoft Office   15'root'office15'powerpnt.exe";
string powerPointFilePath = "'"" + "C://Users/Route Plotter.pptx" + "'"";
Process powerPoint = new Process();
powerPoint.StartInfo.FileName = powerPointPath;
powerPoint.StartInfo.Arguments = " /S " + powerPointFilePath;
powerPoint.Start();

我试过使用Office的intrp方法，但是无法在幻灯片模式下直接打开。

Microsoft.Office.Interop.PowerPoint.Application pptApp = new Microsoft.Office.Interop.PowerPoint.Application();
pptApp.Visible = Microsoft.Office.Core.MsoTriState.msoTrue;
pptApp.Activate();
Microsoft.Office.Interop.PowerPoint.Presentations ps = pptApp.Presentations;
Microsoft.Office.Interop.PowerPoint.Presentation p = ps.Open(powerPointFilePath, 
            Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoTrue)

关于如何阻止它将空格更改为%20(我已经在路径周围添加了引号)，或者直接将文件打开到幻灯片模式的其他方法，将不胜感激。

(我使用VS2013和PowerPoint 2013)

        Application ppApp = new Application();
        ppApp.Visible = MsoTriState.msoTrue;
        Presentations ppPresens = ppApp.Presentations;
        Presentation objPres = ppPresens.Open("C:''Users''Users''Documents''Projects''LS''WindowsFormsApp1''PPT.pptx", MsoTriState.msoFalse, MsoTriState.msoTrue, MsoTriState.msoTrue);
        Slides objSlides = objPres.Slides;
        SlideShowWindows objSSWs;
        SlideShowSettings objSSS;
        //Run the Slide show                                
        objSSS = objPres.SlideShowSettings;
        objSSS.Run();
        objSSWs = ppApp.SlideShowWindows;
        while (objSSWs.Count >= 1) System.Threading.Thread.Sleep(100);
        //Close the presentation without saving changes and quit PowerPoint                             
        objPres.Close();
        ppApp.Quit();