IPersistFile::Save method keeps failing to save the shortcut

IPersistFile::Save method keeps failing to save the shortcut

I am trying to save a shortcut to my application in the startup folder. It
all compiles, but it fails to actually save the game. The error seems to
occur at hres = ppf->Save(wsz, TRUE);, where hres is set to -2147024891.
If that means something specific, I haven't discovered what yet. My code
is copied almost verbatim from MSDN, so I'm pretty confused why it isn't
working. Perhaps I don't have permission to save a shortcut to the startup
folder? Then again, I am also fairly new to all this, so it might be some
basic error I am making. I am copying in all my #includes as well in case
that is the problem.

#include <windows.h>
#include <string>
#include <stdio.h>
#include <shobjidl.h>
#include <shlobj.h>
#include "objbase.h"
#include <objidl.h>
#include <shlguid.h>
#include <winnls.h>
#using <System.dll>
#using <System.Windows.Forms.dll>
using namespace System;
using namespace System::Windows::Forms;
char startupDestination[MAX_PATH];
char mediaMaestroLocation[MAX_PATH];
DWORD nChars = 0;
BOOL yChars = 0;
HRESULT CreateLink()
{
CoInitializeEx( NULL, 0 );
HRESULT hres = 0;
IShellLink* psl;
if (SUCCEEDED(hres))
{
// Get a pointer to the IShellLink interface. It is assumed that
CoInitialize
// has already been called.
hres = CoCreateInstance(CLSID_ShellLink, NULL,
CLSCTX_INPROC_SERVER, IID_IShellLink, (LPVOID*)&psl);
if (SUCCEEDED(hres))
{
IPersistFile* ppf;
// Set the path to the shortcut target and add the description.
psl->SetPath(mediaMaestroLocation);
psl->SetDescription("Media Maestro");
// Query IShellLink for the IPersistFile interface, used for
saving the
// shortcut in persistent storage.
hres = psl->QueryInterface(IID_IPersistFile, (LPVOID*)&ppf);
if (SUCCEEDED(hres))
{
WCHAR wsz[MAX_PATH];
// Ensure that the string is Unicode.
MultiByteToWideChar(CP_ACP, 0, startupDestination, -1,
wsz, MAX_PATH);
// Add code here to check return value from MultiByteWideChar
// for success.
// Save the link by calling IPersistFile::Save.
hres = ppf->Save(wsz, TRUE);
ppf->Release();
}
psl->Release();
}
}
CoUninitialize();
return hres;
}

Here is the click event in the UI that calls the function:

void settingsLaunchOnStart_Click( Object^ Sender, EventArgs^ e )
{
if (settingsLaunchOnStart->Checked == false)
{
HRESULT r;
nChars = GetModuleFileName( NULL, mediaMaestroLocation,
sizeof(mediaMaestroLocation) );
yChars = SHGetFolderPath( NULL, CSIDL_STARTUP, NULL,
SHGFP_TYPE_CURRENT, startupDestination);
r = CreateLink();
}
else if (settingsLaunchOnStart->Checked == true)
{
//code to remove the shortcut
}
}


Is there something I am missing?