Cannot configure a custom sound because space in path?

[Webmarco]

There is no sirene attached to my system. When I try to configure a custom build sound which is located at C:\Temp\Sirene.wav, the following error is logged:

C:\Program Files (x86)\Siren of Shame\Sox\sox.exe FAIL formats: can't open input file `van': No such file or directory

2016-02-03 12:32:08,467 [1] ERROR SirenOfShame.Program [(null)] - Global error
System.IO.FileNotFoundException: Could not find file 'C:\Users\Marco van\AppData\Local\Temp\sox\8e6652c5-707e-4661-8bdf-8d8b68e2d833.wav'.
File name: 'C:\Users\Marco van\AppData\Local\Temp\sox\8e6652c5-707e-4661-8bdf-8d8b68e2d833.wav'
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at SoxLib.Helpers.DeleteFileStream..ctor(String fileName)
at SoxLib.Sox.Convert(Stream input, ConvertOptions options)
at SirenOfShame.Lib.Services.AudioFileService.ConvertToWav(String sourceFileName, String destinationFileName, Boolean highQuality)
at SirenOfShame.Lib.Services.SoundService.CopyOrConvertToWav(String sourceFileNameAndPath, String destinationFileNameAndPath)
at SirenOfShame.Lib.Services.SoundService.AddSound(SirenOfShameSettings settings, String fileNameAndPath, String fileNameAndExtension)
at SirenOfShame.Configuration.ConfigureSounds.AddSound(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
2016-02-03 12:32:08,475 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - OperatingSystem: Microsoft Windows NT 6.2.9200.0
2016-02-03 12:32:08,475 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - DotNetVersion: 4.0.30319.34209
2016-02-03 12:32:08,475 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - SosVersion: 2.3.10
2016-02-03 12:32:08,475 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - SoftwareInstanceId: 4406
2016-02-03 12:32:08,475 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - DeviceConnected: False
2016-02-03 12:32:08,476 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - ErrorDate: 2/3/2016 12:32:08 PM
2016-02-03 12:32:08,476 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - ErrorMessage: Could not find file 'C:\Users\Marco van Dorst\AppData\Local\Temp\sox\8e6652c5-707e-4661-8bdf-8d8b68e2d833.wav'.
2016-02-03 12:32:08,476 [1] INFO SirenOfShame.Lib.ExceptionMessageBox [(null)] - StackTrace: System.IO.FileNotFoundException: Could not find file 'C:\Users\Marco van\AppData\Local\Temp\sox\8e6652c5-707e-4661-8bdf-8d8b68e2d833.wav'.

Looks like the application cannot handle a space in a directory name, there is a space between 'Marco' and 'van' in the path
Is this a bug or am I supposed to configure something somewhere?